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READ THE INSTRUCTI
ION MANUUAL BEFORRE USING

INSTRUCTION MANUALMANOSTARSWITCHMS99

No. TR-MS99-E03

1--2-3,Nishi-shiiriike-cho,Naggata-ku,Kobe,,Hyogo 653-00031 JAPANTEL. +81-78-631-6+
6000 FAX. +881-78-631-60
020

TABLE OF CONTENTS
PAGE

INTRODUCTION .............................................................................................................................. 1
Ⅰ．PRECAUTIONS ....................................................................................................................... 1
Ⅱ．THE NAME OF EACH PART........................................................................................... 2
Ⅲ．INSTALLATION
1. Caution of service condition .................................................................................... 2
2. Installation of MS99 ....................................................................................................... 2
3. Installation position ........................................................................................................ 3
4. Wiring material ................................................................................................................... 3
5. Accessory for MS99 ...................................................................................................... 3
6. Accessory for type C ................................................................................................... 4
7. About an exchange of type C piping connector. ......................................... 5
8. Pressure of measurement and connection of piping ................................. 5

Ⅳ．SETTING OF PRESSURE
1. Switch contact configuration ................................................................................... 6
2. Setting of upper limit/ lower limit ........................................................................ 6
3. Setting the dial.................................................................................................................. 7
4. Reset time ........................................................................................................................... 7

Ⅴ．ABOUT BUILT-IN SWITCH
1. Material of contact ......................................................................................................... 8
2. About measured gas and contact failure .......................................................... 8
3. Protection of contact of switch ............................................................................. 9

Ⅵ．GENERAL PRECAUTIONS
1. Prohibition of common piping .............................................................................. 10
2. Prevention of clogged piping due to drain.................................................... 10
3. Measurement of high temperature gases ..................................................... 10
4. Errors caused by long distance piping ........................................................... 10

Ⅶ．PERIODIC INSPECTION ............................................................................................ 11
Ⅷ．PRODUCT WARRANTY ............................................................................................. 11

INTRODUCTION
Thank you very much for purchasing of "MANOSTAR SWITCH MS99".
To ensure your safety in using this instrument :△！

Caution・Be sure to read the instruction manual carefully before using the instrument so that you
can use it properly.
Wrong use may result in failure of the instrument and lead to its damage and accident. Thismanual should be kept in a proper place so that you can refer to it any time you need.

Ⅰ．PRECAUTIONS△Warning！

・Do not use the instrument where flammable gas is present.
The instrument is not explosion-proof. Do not use instruments in the circumstance where flammable gas is present. It
may cause explosion.

・Do not use the instrument at the place where corrosive gas is present.
The instrument is not corrosion resistance construction. Measuring corrosive gas may corrode the receiving element
and housing material of the instrument. It is expected that corrosive gas leaked out of the instrument will harm aperson.

・Do not apply the pressure to the instrument more than it can withstand.
The diaphragm and the retainer are broken and cause of injury or accident, etc. disaster if the pressure exceeding
withstanding pressure of the pressure receiving element is applied to the instrument. The case body and thetransparent cover of the instrument are broken and cause of injury or accident, etc. disaster if the pressure exceeding
withstanding pressure of the instrument body is applied to the instrument.

・The instrument is measurable for air and non-corrosive gas only.
The machine is exclusive use of dry air (90％RH or less). Using measuring the water or oil it may be damaged andcauses the accident.

・Avoid using where the instrument is subject to many vibration and impact.
Using the instrument where intensified vibration and impact may be damaged the instrument. It is expected that gas
leaks of the instrument which harms a parson.

・Do not exceed rated surrounding temperature, humidity and altitude in use.
Using the instrument by exceeding rated surrounding temperature and humidity and altitude it may be damaged andcause the accident.

・Do not disassemble or reconstruct the instrument.
It may void the warranty.
・Do not exceed rated voltage in using
Using the instrument by exceeding rated voltage may cause fire or electric shock.
・Wire correctly.
Incorrect wiring may cause fire.

△Caution！

・As to where to install and how to install this instrument, be sure to follow the instruction manual provided
so as to ensure a proper method.
・Use the instrument indoors.
・In case of not being installed in dry and well-kept clean locations, the instrument must be enclosed in box.
・Do not use organic solvent for cleaning.
Use a cloth soaked with water-diluted neutral detergent to wipe the surface of a product. Using of organic solventcauses damage on the surface.

・Dropping the product.
Product is a precision instrument. If you drop the product, there is a possibility that the exterior, also the interiormechanism damage.

・Removal of the piping
Please do not pull the pipe with a strong force. There is a possibility that the pipe cap is broken.

・MS99 acquires UL-approved as an open type enclosure.
For UL listing application, install MS99 in the system, and configure so that the entire system will be UL-approved.

1

Ⅱ．THE NAME OF EACH PART・Type V・Type C
Cover
Installation screwfor coverHigh pressure
side piping
connector

PointerCable clamp holder(Interchangeable)

Terminal screws

Low pressure
side piping connector

High pressure
side tube tap(Interchangeable)

Dial

Installation plate
Low pressure
side tube tap(All except for the piping connector part iscommon with type V)

Ⅲ．INSTALLATION
Before using this instrument, make sure if it is the type that you requested and meets the demand of theenvironment, pressure and piping conditions where it is used, by specification.

1. Caution of service conditiona) Do not use the instrument in a place subjected to direct sunlight, vibration or shock, or excessive
moisture. In particular, vibration and shock to the instrument should shorten its life.
b) Use under the medium and ambient temperature from - 10 to + 50 ℃.
c) The instrument is not waterproof. Do not use it in a place subjected to rain, or other splashing water.
The product is equivalent to the protection class IP54, when mounted as below.
1）Use the cable clamp which matches the wire diameter of the wiring.
2）Please install it so that a gap doesn't occur between a cover and the body by a screw for coverinstallation of an accessory.
※Please refer to the item of p.3 "5. Accessory for MS99" about cable clamp.
d) In installing the instrument, select the place where the ground is smooth and flat.

2. Installation of MS99
Panel cut size

90±0.32×φ5 or M4!
△

Caution2

・The tightening torque of the screw is 1 N･m.
・Do not apply excessive torque more thanstipulated value, otherwise it will damage thebody of the instrument.

3. Instaallation posittion
Muust be specifiied at time of order.
Affter inspectionn and adjustm
ment in accorddance with the specified installation possition, and shiipped.
On installatioon panel, follow
wing
position is available.

Vertical plane°5° Verticall
5°
90°

Horizonntal△！

Caution

5°5°

0°
°

Horizontal
planneUse of in a possition other thhan the specified is out off accuracy waarranty.

4. Wirinng materialThee wiring directioon

Chhoose the wirring material dependingdon the load. Terminal
sccrew of the product is M4. Wire bby performing thetermination of the crimpingg terminal (OO.D. less than φ8whhich matches the general M4
M screws.) T
The wiring direction
caan be changedd by changing the directionn of the coverr.
Fuurther, an attachment poinnt of the cablee clamp receip
pt canbee chosen fromm 2 points.

（Wh
hen cable clam
mp, which is soldd separately, iss
insstalled.）M
5. Acceessory for MS99
Installation platte

Cooveraluminum，copper made [ installed ]poolycarbonate-m
made [ installedd]Product ccode

Product codee

ADPL999-01

TCA-99Used wiith the installation of the in
nstrument bo dy.

＜Installation＞＞

LECTRIC CO., LTTD.)
Cabble clamp (produuced by OHM EL
nylon66，polypro
opylene，NBR made [ option ]Product code

Suitable wire
diametterO
OA-W15M-04
4

φ2～
～4

O
OA-W15M-05
5

φ3～
～5

O
OA-W15M-07
7

φ5～
～7

Cable claamp holder
O-ringUse the cable clamp below so as to maake it equivalennt to theprotectioon class IP54.
※When taking wiring out
o in the conneector direction by typeC, it ccan't be installeed for a connecctor and cable cclamp tointervvene.

3

1.R
Remove the loocknut. The
locknut is not necessary to
install the instrrument.

2.The cable clamp screwed tot it,by hand. Att that time, O-ring of
the cable cllamp is compreessed,
and, parts area in contact(without a gap).
g
Caution, parts
may be dam
maged if too muuchtightening.

6. Accessory for type C
MT connectorr for metal tubeebrass-madde [ option ]VT connector for vinyl or rubber tube
reny-made [ installled ]Product coode
Product ccode

High ppressure

Low
L pressure

KGA99VVT

KGA881MT-H

KGA81MT-LK

Be sure to use I.D.6 annd thickness off 1mm or more.
rtube with enough withsstanding
Howeverr, the vinyl or rubberpressuree (including vaccuum pressure) is required whhen the
instrumeent range or thee line pressure is higher than 50 kPa.
VR connecttor for vinyl or rubber tube
brasss-made [ optio
on ]
Prod
duct code
High pressure

Low pres sure

KGA81VR-H

KGA81V
VR-L

MR connectorr for metal tubeebrass-madde [ option ]Product coode

These coonnectors are rotaryrelbow ty
ype and can beconnecteed to vinyl or rubberrtube of I.D.
I
6.

Prod
duct code
Low pres sure

KGA81PT-H

KGA81P
PT-L

Low
L pressure

KGA881MR-H

KGA81MR-LK

PR connector for plastic tube
PBT, brass-m
made [ option ]Product coode

The jointt installed tubee is push-in typ
pe. Use the opttional
tube or tthe applicable tubet(JIS B8381-1).
MTW connectorrM
stainlesss steel-made [ option ]High ppressure

Low
L pressure

KGA881PR-H

KGA81PR-HK

The joint installed tube is pussh-in and rotarry elbow type.
Applicable pipiing material is tthe same as PT
T connector.

Produ
uct code
H pressure
High

High ppressureThis connectorr is rotary elboow type and cann be connectedd
to the metal tuube (made fromm copper and aluminum and sooon). Applicablee piping materiaal is the same asa MTconnector.

PT connnector for plasttic tube
PBT, brass-madeb[ option ]High pressureThis connectorr can be conneected to the meetal tube (O.D.6±0.1) made from copper, aluuminum and so on.
When this connector is conneected to plasticc tube (O.D.6,
I.D.4), remove the brass-madde sleeve and useu the resinouus
inner sleeve seet (XIN6×4) thaat is sold separrately(Please use thee type MTW coonnector for the stainless steeelpipe)

Low presssure

Adaptor forr rear piping
brass-madde [ option ]KGA
A81MTW-H-S
S KGA81MTW
W-L-S

Product coodeThis is cconnector can beb connected to stainless tubee(O.D.6±±0.1).
Inner sleeeve set for plastic tube
polyproppylene-made [ option ]High ppressure

Low
L pressure

KGA881FBA-H

KGA81FBA-L

When using a revolvingrconneector, it's posssible to makedifference in leevel so as not tto interfere eacch pipe.
(the following figure)f

Productt code

XIN66X4
You needd this to conneect plastic tubee (O.D.6, I.D.44) to theconnectoors for metal tuube. （the follow
wing figure）
Inner（resin)
Sleeve（reesin)
Plasstic tube

A
Adaptorfor rear pipingp△！

Cautioon

Commerrcial products (connectors ettc.) can’t be ussed, because th
he structure is different.
Please beb sure to use a connector mmentioned abovve.

4

7. Abouut an exchannge of type C piping connnector.
W
When exchanging a connecto
or, remove a ccap, and pleasse install a cap of mentioninng in p.4 "6. AccessaryA
forrtype C".

cwaas loaded
The examplee on which a connector
VR connnector

MT connnector

ector
MTW conne

PT connectoor・Even if this applia
ance replacess a connectorr, the polarity
y in a high prressure side anda the lowpresssure side can''t be changedd.
・The partp of connec
ctor piping is marking“ H” ono high pressure side and““ L” on low pressure side.

△
Cautiion！

・Tighttening torque
The plugp sealing betweenbthe ppiping connector port of the
instruument, the pip
ping connectoor, and the seealing plug is achievedaby O--rings. The tightening torqque of the connnector is 1Nm. The
meteer body is dam
maged for fasttening beyondd the stipulate
ed value,so pleease be carefful.
・Tighttening with loc
cking spannerr
Alwayys use lockingg spanner to tighten the riing joints for MT
connectors (for metal tube), M R connectorss (rotating typ
pe formetaal tube) and MTW
M
connectoors. Be carefu
ul not to apply
y thetighteening torque directly to th e instrument body.

Spanner fortightening

Locking spanner

Cap nut

8. Presssure of meaasurement anda connectiion of pipingga) Measuremennt of positive pressure
Connect thhe tube to thee high pressurre side piping connector (HH).
The lowerr pressure porrt (L) should oopened to atm
mosphere, butt do not remoove the pipingg connector.
b) Measuremennt of negative pressure
Connect thhe tube to thee low pressuree side piping connectorc(L)). The high prressure port (H)( should be
opened to atmosphere,abutb do not rem
move the pipiing connectorr.
c) Measuremennt of differenttial pressure
Connect thhe tube from thet high presssure piping co
onnector to th
he high pressuure port (H) anda from thelow pressurre piping conn
nector to the low pressure port (L).

5

Ⅳ．SETTING OF PRESSURE
1. Switch contact configuration
・Composition of contact of this instrument is as shown on the right.
・If the instrument is not applied by differential pressure we call such “normal condition”.
・At normal condition, the contact between 1(COM.) and 2(N.C.)
is closed, and between 1(COM.) and 3(N.O.) is open.
・With increase of differential pressure and reaching theactuation pressure, the contact will be changed over ;between 1(COM.) and 2(N.C.) is opened and between
1(COM.) and 3(N.O.) is closed.

1(ＣＯＭ.)

3(Ｎ.Ｏ.)
2(Ｎ.Ｃ.)

Increase ofdifferential
pressure

2. Setting of upper limit/ lower limit
・When differential pressure applied to the instrument isincreased starting from zero and changes over the electriccontact from N.C. (normal close) to N.O. (normal open), thepressure at this moment is called “actuation pressure”.
・When this differential pressure decreases from the pressure
higher than this actuation pressure activating electricalcontact and returning the contact from N.O. (normal open) to
N.C. (normal close), the pressure at this moment is called“reset pressure”.

Actuation pressure

Dead band
Differential
pressure
Reset pressure

Time・There is certain difference between actuation pressure and reset pressure and this is called “dead band”.
・There are two types of the instrument. One is called “upper limit setting type”type (H) whose scale ofsetting knob is adjusted on actuation pressure, the other is called “lower limit setting type”type (L)which is adjusted on reset pressure.
・Depending on the purpose of use, choose the instrument either “upper limit setting type”or “lower limit setting type”
Please confirm the following table about the respective movement.
In case of 1-10 kPa range with set value 1 kPa. (dead band is 0.7 kPa)
Setting of scale
Upper limit
setting type

Adjusted in activating pressure

Lower limit
setting type

Adjusted in reset pressure△！

CautionMovement of contact

Adjusting of scale

When the differential pressure increases, the circuit isclosed between N.O. and COM. at 1 kPa.
Then as the differential pressure decreases, the circuit isopened between N.O. and COM. at 0.3 kPa.
When the differential pressure increases, the circuit isclosed between N.O. and COM. at 1.6 kPa.
Then as the differential pressure decreases, the circuit isopened between N.O. and COM. at 1 kPa.

It can't be changed from the lower limit setting to the upper limit setting or vice versa.

6

3．Setting the dial
Use the dial and pointer, when you set the “Activating pressure” or “Reset pressure”.
Set the "Activating pressure" for the upper limit setting.
Set the "Reset pressure" for the lower limit setting.

Pointer［fixed]

Dial（color:white）[movable]

Dial cover（color:black）［fixed]

0

40

10

60 80

16

20

120 1 4 00

1 8 0 20 0

Set the tip of the pointer to the pressure you desire by knobbing the outer periphery of the dial to rotate thedial. Turning the pointer from the lower side (anti-clockwise) is recommended to set accurately with good
reproducibility. Turning the pointer from the lower side (anti-clockwise) is recommended to set accurately
with good reproducibility.

△！

Caution

Do not turn the dial too much exceeding the upper bound or the lower bound of the scale.
It causes performance deterioration and the failure.

4. Reset time
The reset time means the time needed for the differential pressure to decline to the reset pressure from theactivating pressure (i.e., the electrical contact is reset) when the differential pressure is sharply reduced tozero. It is about three seconds at 20 Pa, and one second at more than 50 Pa for Manostar switches. (Thisvalue is only for the instrument itself and does not include the effect of piping.) Therefore, a response
quicker than this value is not possible.

7

Ⅴ．ABOUT BUILT-IN SWITCH
1. Material of contact
The product has been plated a gold layer on the point of contact to get the contact reliability of the point on
the low electrical load.
The gold film is damaged when using by general use.

△！

CautionOnce the product has been used for general load, it cannot be used for low electrical load.

2. About measured gas and contact failurea) Corrosive gas
If the gas to be measured contains corrosive gases (nitric acid, hydrogen sulfide, sulfurous acid,ammonia, chlorine, and so on), they may cause electrical contact failure or corrosion of internalmechanism, which leads to malfunction of the switch. Do not use the switch for the gases containing
high humid air because in such gases, the arc generated by opening/ closing the contact produces nitricacid, and it may also cause electrical contact failure or malfunction of switches.
b) Silicone gas
If the gas to be measured contains silicon produced from silicon (contained in oil, grease, filling agent,and so on), the gas produced by arc, generates by opening/ closing the contact, accumulates on thecontact surface and causes contact failure. Take corrective measures such as the removal of the gas
source or arc suppression.
c) Dust and organic gas
The film can be made to the switch part by the composition of the gas. In addition, the dust contained in
the gas to be measured can adhere to the contact surface and be changed into carbide caused thecontact failure by the arc generated when the contact is opened or closed. Therefore, pay attention to
the measurement environment as well.
(Even with gold alloy contact, be careful about the dust.)△！

CautionAs the opening/ closing frequency of the contact increases, wear dust from thecontact increases. This wear dust accumulates between the contacts to increase thecontact resistance and causes the malfunction in the load circuit.
In particular, the surrounding where there exists continuous vibration and impact will bemost likely to cause contact failure due to worn powder.

8

3. Protection of contact of switch
・Contact protection circuit is used to extend the service life of contact. It reduces generation of noise at
the time of switching on and off. It also minimizes carbide and nitric acid gas generated by arc. Use thiscircuit correctly, otherwise it will cause reverse effect, making the matter worse.
・In case of using contact protection circuit, pay attention the operating time is possibility of delaying a little.
The following are typical examples of contact protection circuit.
a) Typical example of protective circuit

U

Example of circuit

P.S.

R
P.S.

I.L.

I.L.

C

I.L.

P.S.

I.L.

P.S.

P.S. : Power supply,Special remarks for application and selection

Varistor
methodThis method is intended not to apply voltage beyond limit ofvaristor to in between contacts. It delays a little time toreturn inductive load such as relay.
Select the most conformed rated model in terms of power
supply voltage and load capacity in selected article byvaristor maker.

C･R
methodIt delays a little time to activate or return inductive loadsuch as relay.
As for CR value, to contact current and contact voltage, theestimate value is C : 0.5 μ F / A, R : 1.0 Ω / V.
However, it differs according to the characteristics of load,
therefore, be sure to confirm to select by experiment.

Diode
methodThis method is intended to consume counter electromotive
force of inductive load by diode and avoid to apply highvoltage to in between the contacts.
This method makes the return time of inductive load
slower. Choose the diode rated current is more than load
current and counter withstand voltage more than 10 timesof power supply voltage.

Diode＋
Zener diodemethodDiode method proves to be effective when the return time
takes too long for inductive load such as relay. When you
choose zener voltage of zener diode, choose base on power
supply voltage. Be careful with limitations having thismethod. Because load is too big, larger capacity zener
diode is needed for reverse surge power.

I.L. : Inductive loadb) Example of wrong protection circuit

P.S.

C

This is very effective to remove arc at the time ofoff-contact, but this is likely to run charged current tocondenser leading to contact sticking and short service lifeat the time on-contact.

I.L.

Condenser method

P.S.

C

P.S. : Power supply,

I.L.

This is very effective to remove arc at the time ofoff-contact, but this is likely to run short circuit current
accumulated in the condenser leading to contact sticking
on contacting.
This is likely to short service life at the time on-contact.

I.L. : Inductive load

If the load is larger than the specified contact capacity, use a secondary relay. In general, the load voltage andthe current is too less to the life of contact is longer. However, this does not expect for a low electrical load.
Manostar switches cannot directly shut off the circuit of 250 V AC or more.
9

Ⅵ．GENERAL PRECAUTIONS
1. Prohibition of common piping
Independent piping○
Room A

Room BMS99

MS99

2. Prevention of clogged piping due to drain

Common piping×
Passageway

Passageway

Piping each of pressure detectors and pressure receiving
instruments tube exclusively dedicated for it, and do notconnect the piping commonly with the adjacent system asshown in the right figure.
Common piping causes measurement error because thepressure of each system interferes.

Room A

Room B

MS99

MS99

Installation diagram of drain tankIf drain remains within the line, it causes measurement error. Be
sure to install the pressure receiving instrument above thepressure outlet port of the pressure detector and arrange the line
so that the drain water should not remain in the slack piping.
If the arrangement mentioned above in not possible, install a draintank within the line as shown in the right figure and clean it once ina while. After the cleaning of the tank, check that the air tightness
is fully kept.

3. Measurement of high temperature gases

Switch

Drain
tank

Drain

In the pressure measurement of high temperature gas, use thepressure detector (pitot tube) made of the heat-proof metal (suchas stainless steel), and connect it with the pressure receiving
instrument through a metal tube which is long enough to cool down
the high temperature gas.

4．Errors caused by long distance piping

10

Instrument
body

Piping length

The speed of response is delayed when the product is used forremote monitoring.
In such application, the I.D. of the connection tube should be as large as
possible.
The time constant is almost inversely proportional to the inner crosssectional area of the piping. (refer to the diagram below)
If the piping conditions of the high and low pressure side are significantly
different, the difference in the piping resistance between high and low
pressure side causes the difference in pressure transmission time, andthe measurement becomes inaccurate.

Ⅶ．PERIODIC INSPECTION
Generally speaking, it is important not to exert external stress to keep life and reliability of the instrument for along time.
Proper use of this instrument will ensure its faultless service over many years without any necessity of periodic
lubrication.
However, it is recommended that it is subjected to periodic inspection (calibration) once a year.

Ⅷ．PRODUCT WARRANTY
Warranty Period
This product warranty is valid for one year from the date of delivery to a place specified by an ordering party who
has transacted directly with Yamamoto Electric Works Co., Ltd.
Coverage
If a product breaks down due to a reason for which we are responsible during the warranty period and you return
the product to us, we will either repair or replace the product free of charge.
This warranty does not cover:(1) Usage of the product under any inappropriate conditions or environment contrary to what is described in our
product catalog, specifications or manual.
Handling or usage of the product other than as described in our product catalog, specifications or manual.
(2) Breakdown due to a reason other than a fault within our product.
(3) Any product that has been modified or repaired by a party other than us.
(4) Any breakdown due to a reason that was not foreseeable based on scientific and technical standards applied at
the time of shipment.
(5) Any breakdown due to a reason not attributable to us such as a natural calamity or other disaster.
These terms of warranty represent our entire liability with respect to the product, and we shall have no liability
for any other loss arising in connection with a breakdown of the product.
*This product warranty is only valid within Japan.
This document is a translation from the original Japanese version, and the original Japanese version has priority
over this translation.
Be sure to refer to the original Japanese for the details of this warranty.

<Prior notice>

The specifications and description of the product explained in this instruction manual may be subject to change
without prior notice because of modification and the like.

11