CATALOG No. 3150
MODEL No. AdC
No. AdS

Pressure-Resistant andExplosion-Proof Electric Contact
Pressure Gauges andPressure Switches

AdC-Type
Pressure Gauges with Contact

AdC-WType
Differential Pressure Gauges with Contact

AdS-Type
Pressure Gauges with Contact

The following places are regulated by Japanese law as hazardous area thatneeds preventive safety measures: an atmosphere containing
the vapor of inflammable material and a place where inflammable gas may
concentrate to an explosive level or where explosive dust exists.
The electrical measuring instruments used at these places must haveappropriate construc-tions specified in the Explosion Prevention Guidelines
for Industrial Electrical Equipment instituted by the Industrial Safety Instituteof Japan, based on the Industrial Safety and Sanitation Law. Theseinstruments must carrya label certifying that they have been approved by the Industrial Safety
Research Association,a Government-authorized inspection agency.
All Asahi Gauge products in this catalog have been approved by theassociation.

ASAHI GAUGE MFG. CO.,LTD.
J A PA N

Description
This type of instruments has a field indicator dial. The indicator unit is locatedremotely from the electric contact switch
unit, and they operate independently toeach other (670).
● A wide choice of contact types are available
to satisfy specific application requirements.
● The instrument is available with various
attachments such as cable outlet, a diaphragm-seal unit, and so on to suit itself toindividual applications.
● Compact and light-weight.
●AdC-Type Pressure-Resistant and Explosion-Proof ElectricContact Pressure Gauges

Specifications
Type of explosion-proof construction:
Pressure-resistant and explosion-proof (d)Explosion class: 2
Ignition group: G4
Class of hazardous area:
Division 1 area. Outdooruse

Model designation

AdC−Pressure range
0〜5KPa−HUpper limit

LLower limit

0〜30KPa

H・L Upper/lower limit

0〜0.08MPa

H１・H２L１・L２0〜0.16MPa

Type of contacts

Wet parts

Remarks

Chamber
SUS３１６With framearrester
Bourdon tube
SUS３１６0〜0.2MPa※ ６７０ Micro-switch
６４９ Indicator contact

Important Note

0〜50MPa

The AdC models of 0.2MPa and under are
required by law to have a flame arrestor
to prevent reverse flame propagation.
The arrestor can cause response delay
for some sample fluids.
For pressure media which may cause
critical delay of response, it is recommended to use one of the two measures:one is to add a water siphon to thepressure inlet of the gauge to convert thetest medium pressure to water pressure,and the other is to add a diaphragm-sealunit.

６４７ Indicator contact relay
６４６ Indicator contact

selfretaining relay

６９０ Photoelectric switch
６７１ Chamber Type with Micro-switch
The mark ※ indicatesstandard model.
Weight about ５.５㎏

1Type of contact
Product nameMicroswitch

Model

AdC-670

AdC-690

Use

Alarm and controller

Alarm and controller

Photoelectric switch

TypeSPDTSPDTPower

Not needed

100ACV or 200ACVSwitchingmechanism

Snap action

Contactless

Capacity(resistance load)

AC250V-10A
DC125V-0.4A

AC250V-5A
DC100V-1A

Capacity(inductive load)

AC200V-1.5A,
DC100V-0.03A

AC100V-2A,
DC100V-0.5A

Accuracy

Within 2% FS

Within 1.6% FS

Repeatability

Within 1% FS

Within 1% FS

2ON/OFF differential

Type of setting

1kg/cm and below: 15%
2 to 3 kg/cm2:
10%
4 to 6 kg/cm2:
7%
10kg/cm2 and over: 5%

Within 3% FS

Internal (external)

Internal (external)

Product nameIndicator
contact

Indicator
contact/relay

Indicator contact/
self-retaining relay

Model

AdC-649

Use

Alarm

AdC-647
Alarm and
simplified
controller

TypeSPST

SPDT

AdC-646
Alarm and
simplified
controller
Self-retaining
circuitPower

Not needed

100VDC or
200VAC

100VAC or
200VAC

Switchingmechanism
Capacity(resistance load)
Capacity(inductive load)
Accuracy

Contact

Contact

Contact

100VAC-0.5A,
100VDC-0.2A
100VAC-0.2A,
100VDC-0.1A
Within 1.6% FS

200VAC-5A,
100VDC-1A
100VAC-2A,
100VDC-0.2A
Within 1.6% FS

200VAC-5A,
100VDC-1A
100VAC-2A,
100VDC-0.2A
Within 1.6% FSRepeatability

Within 0.5% FS

Within 0.5% FS

Within 0.5% FS

ON/OFF differential

000

Type of setting

Internal (external)

Internal

Internal

AdC-670

AdC-670df H
1/4 16 138
3/8 18 141
1/2 20 143

Conduit outlet GC1/2

Pressure-proof packing type / version

140140df H
1/4 16 138
3/8 18 141
1/2 20 143

140

104-φ12140
f

OUTSIDE SETTINGSCREWON SPECIAL ORDER

φ578.2CABLE
CABLESIZE
φ7〜φ11145

OUTSIDE SETTINGSCREWON SPECIAL ORDERf

H±3

H±3145G3φ53Gd

H±3

24×28HEXf

24×28HEXRd
NPT dfG1/2（G3/4）

φ164
φ100H±3140

φ1004-φ12RdNPT d2

Description
The AdC-W Type model is a directly-mounted
type pressure-resistant and explosion-proof
differential pressure switch operating on apressure difference between two differentpressure both collected from individual
sources. Typical applications include measuring of pipe-line flow rates, detection offilter-clogging, control of liquid level in astorage tank, etc.

Specifications
Type of explosion-proof construction:
Pressure-resistant and explosion-proof (d)Explosion class: 2Ignition group: G4Hazardous area: Division 1 area. Outdoor use

Explanation of Model Designation

AdC-W – Type of Contact – Number of Contacts – Differential pressure range

AdC-W Type Pressure-Resistant and Explosion-Proof
Differential Pressure Switches

STANDARD SPECIFICATIONS
ModelType of contact

Differential
pressure range

Indicator

No. of contacts

One-Side press
resistance MPa

Refference pressMPa

No

1

0.05

5Yes

10.1

51

50〜5kPa

0〜15kPa

0〜20kPa
AdC-W-787ME

Microswitch
0〜0.08MPa

0〜0.1MPa

0〜0.6MPa

No2Yes

1No2The diaphragm type is available in a differential pressure range of 0 to 0.1 MPa or higher.

3140
140
104-φ12H±3140φ100

φ1643H±G1/2（G3/4）

24×28HEX

3f

G30°

78.2145f

H±3df H
1/4 16 156
3/8 18 158
1/2 20 160

RdNPT d＊Gauges with a packing-type wire outlet are made to order.

otherSize

150

Material of wet parts

316/NBR

Connection screw

G3/8, G1/2

On-Off differential

7%F. S-7%F. S Below

Repeatability

1%F. S

Accuracy of indicator±1.6% F. S

Operating temp

−10〜＋40℃

Capacity

AC250V10A(Resistance load)

DC125V0.4A

Elements

Bellows

FinishGray painting

Setting

internalWeightabout 8.5kg

4Description
Compact and lightweight (3.2kg).
Easy to preset externally.
● Fast access to the movement can beachieved simply by removing the bezel forease of service and check.
● The special inlet design eliminates the needfor a flame arrestor so it provides response
speed as fast as an ordinary pressuregauge.
● A variety of mounting styles are available,
including self-standing, panel-mounting,pipe-stand-mounting, etc.
●●Small-Size Pressure-Resistant and Explosion-Proof
Pressure Switches

Specifications
Type of explosion-proof construction:
Pressure-resistant and explosion-proof type (d)Explosion class: 2Ignition group: G4
Hazardous area: Division 1 area. Outdoor use

STANDARD SPECIFICATIONSType of contact

Capacity

Repeatability

Setting method

strength test

FinishMicroswitch

AC250V10A
DC125V0.5A（Resistance load)
AC200V1.5A
DC100V0.03A（Inductive load）

1%FS

External driver

AC1500V
1min

silver grayAcceptanceNo.

Model Designation

AdS−
24957

No. ofcontacts−−−
Pressurerange

1：1 one contact

24958

2：2 two contact
External lead inlet24959

2F：2B PipestandMaterial of Diaphragm-seal Unit

Number ofcontacts

ON/OFF
Differential

0−0.08316

114% FS0.1〃〃

12% FS−0.1〃〃

12% FS0.2〃〃

7% FS0.3〃

1 or 27% FS

0.4

〃

〃

7% FS

0.6

〃

〃

6% FS1〃〃

6% FS2

〃

〃

4% FS

2.5

〃

〃

4% FS

3.5

〃

〃

4% FS5〃〃

4% FS7〃

〃

4% FS

10

〃

〃

4% FS

※14W： Wallmounting

C4： conduit GC1/2※ C6： conduit GC3/4

24960

24961

Range MPa

P8： pressure-resistant packing, cable 6-8P10：
8-10〃※ P12：
10-12
〃
P13：
11-13
〃P15：13-15〃weight about 3.2㎏

※The mark ※indicates standard model.
※3%FS ON-OFF differential version is custom-made for 0〜0.08MPa pressure ranges.

5Direct Lead-Inlet Type

1C42

C6PANELAdS

1C42C6NAME PLATE

NAME PLATESET COVERSET COVER
84.5

230

2

TERMINAL BOX

φ122

TERMINAL BOX

ADJUSTING SCREW

2219221970
9949.5h1517f
2Gd

Rd.FEMALE
NPT d
NET WEIGHT ABOUT 2.9kg

Rd.
NPT d17ff 15f
27090

φ5317

CONDUITfh15Gd172h70
9917h15f 15

2

CONDUITφ53h

174-φ10

2B PIPE

64124

64124

φ102

ADJUSTING SCREW

114

230

φ102

φ122

PIPE STAND

h15AdS

70904-φ10Rd.FEMALE
NPT d

R NPT d79

Lead Cable Outlet
ModelRemarks

Size

C4

GC1/2

Direct type

※C6GC3/4〃P10

Pressure-resistant packing type, protective tube screw GC1/2

9〜11 cable dia.

※P1210〜12〃〃

GC 3/4

P1513〜15〃〃〃

The mark ※indicates standard model.

Pressure-Resistant Packing Lead-Inlet TypeP212PANELAdS1P212NAME PLATENAME PLATESET COVERSET COVER
84.5

CABLE φRd.
NPT dφ102
CABLE φ9049.544h15

THREADS FOR CONDUIT

1717

THREADS FOR CONDUIT
17f2f17h15h1544156

1970Gd.

90

Rd.FEMALE
NPT dRd.
NPT dd
RC1/4
NPT1/4-F
G3/8
R3/8
G1/2
R1/2
NPT1/2

62B PIPE

φ5370

f
2Gd.

TERMINAL BOX

ADJUSTING SCREW

124h

156

2h

19124

φ53f 15φ122

2

TERMINAL BOX

2φ102

ADJUSTING SCREW

114230f 15230
φ122

PIPE STANDf1h
15AdSfh

124218552057RCd.
NPT d79

Explosion-Proof Construction
Explosion-proofconstruction

dExplosion class2

Ignition group

G4

Pressure-resistant explosion-proof construction(enclosed construction; inflammable sources areisolated in the case)
Minimum gap with 25mm-length of path which
permits the flame propagation.
Minimum gap, over 0.4mm up to 0.6mm.
Ignition point, over 135°C up to 200°C.

Classification of Hazardous Areas
Hazardous areas are broken down into thefollowing categories according to a period
during which a hazardous atmosphere iscontinuously present, and the frequency andpossibility of hazardous atmosphere occurrence:
An area in which a hazardous atmosphere ispresent or may be continuously present.
An area in which a hazardous atmosphere is
likely to occur under the normal operating
conditions, or by gas leakage or other accidents
during servicing job.
An area in which a hazardous atmosphere is
likely to occur under abnormal operation.

Division 0 Area

Division 1 Area

Division 2 Area

Example of Classification of Typical Explosive Gases
Ignition group

G1G2G3G4G5Explosion classAcetone

Ethanol

Gasoline

Acetaldehyde

AmmoniaAmylacetate-isoHexane

Ethyl ether

Carbon monoxide
EthaneI-Butanol

Acetic acid1

Ethyl acetate
ToluenePropaneBenzeneMethanol
Methane23

Coal gas

Ethylene
Ethylene oxide

Water gas

Acetylene

HydrogenNote: In the above, d2G4 may apply to Class d1G1 through d2G4.

Carbon disulfide