INSTRUCTION MANUALBARGRAPH INDICATING ALARM
BEFORE USE ....
Thank you for choosing us. Before use, please check contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact our sales office or representatives.
■ PACKAGE INCLUDES:
Bargraph indicator (incl. scale plate)..................................(1)Mounting bracket.................................................................(2)Bezel*1..................................................................................(2)Watertight packing..............................................................(1)*1. The size of included bezel differs depending on option code.

■ MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.
■ INSTRUCTION MANUALThis manual describes necessary points of caution whenyou use this product, including installation, connection andbasic maintenance procedures.

POINTS OF CAUTION■ CONFORMITY WITH EU DIRECTIVES OR UK LEGISLATION• This equipment is suitable for Pollution Degree 2, Measurement Category II (output, transient voltage 2500V)
and Installation Category II (transient voltage 2500V).
Reinforced insulation (signal input to output to powerinput: 300V) is maintained. Prior to installation, checkthat the insulation class of this unit satisfies the system
requirements.
• The equipment must be mounted on a panel surface.
Once mounted on a panel, take appropriate precautions
to prevent operators to be exposed to the terminal block.
• Altitude up to 2000 meters.
• The equipment must be installed such that appropriate
clearance and creepage distances are maintained to conform to CE or UKCA requirements. Failure to observe
these requirements may invalidate the CE or UKCA conformance.
• The actual installation environments such as panel configurations, connected devices, connected wires, may affect the protection level of this unit when it is integrated
in a panel system. The user may have to review the CE orUKCA requirements in regard to the whole system andemploy additional protective measures to ensure the CE
or UKCA conformity.
• In order to enable the operator to turn off the power input immediately, install a switch or a circuit breaker according to the relevant requirements in IEC 60947-2 andproperly indicate it.
■ POWER INPUT RATING & OPERATIONAL RANGE• Locate the power input rating marked on the product andconfirm its operational range as indicated below:
100 – 240V and 85 – 264V AC rating: 85 – 264V, 47 – 66 Hz,				approx. 6VA
24V DC rating: 24V ±15%, approx. 2W

MODEL48NAV■ GENERAL PRECAUTIONS• Before you remove the unit or mount it, turn off the power
supply and input signal for safety.
• Be sure to put the terminal cover on while the power issupplied.
■ ENVIRONMENT• Indoor use.
• If the unit’s environmental protection is compromised(e.g. when multiple units are to be mounted side by side)
when heavy dust or metal particles are present in the air,install them inside an enclosure with a proper ventilation.
• Do not install the unit where it is subjected to continuousvibration. Do not subject the unit to physical impact.
• Environmental temperature must be within -10 to +55°C(14 to 131°F) with relative humidity within 30 to 90% RH
in order to ensure adequate life span and operation.
■ REQUIREMENTS TO ENSURE IP65
• Observe the designated panel cutout size (31.5 × 138 mm).
• Single mounting only. IP65 is not ensured when the units
are clustered side by side.
• The watertight packing included in the product package
must be placed behind the front cover.
• The mounting bracket must be fastened tightly until they
hit the panel.
• Confirm visually that the packing is not contorted or excessively run off the edge after installation.
■ WIRING• Do not install cables close to noise sources (relay drive
cable, high frequency line, etc.).
• Do not bind these cables together with those in which
noises are present. Do not install them in the same duct.
■ TERMINAL BLOCK• The terminal block is separable in two pieces. Loosen twoscrews on top and bottom of the terminal block to separate.
• Be sure to turn off the power supply, input signal andpower supply to the output relays before separating theterminal block.
Terminal Block Screw(top & bottom)
Terminal Block

Separable■ AND ....
• The unit is designed to function as soon as power is supplied, however, a warm up for 10 minutes is required forsatisfying complete performance described in the datasheet.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-9437 Rev.11

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48NAVCOMPONENT IDENTIFICATION
A504030201001020304050m3/h

Brackets
100 SET9080
H706050S•ZL40302010M

Body0%

Scale Plate
Pull up the part ‘A’ when replacing the scale plate.

INSTALLATION■ PANEL CUTOUT unit: mm• Horizontal Mounting+1+1138 –0

138 –0138 –0+131.5 –0+1

■ SINGLE MOUNTING (Conform to degree of protection IP65)• Vertical Mounting+131.5 –0

Panel thickness: 1.6 – 8.0 mm

164 min.
Panel thickness: 1.6 – 8.0 mm

61.5 min.

■ CLUSTERED MOUNTING (Not conform to degree of protection IP65)• Vertical Mounting• Horizontal Mounting+1+1138 –0

L

138 –0+1

138 –0Panel thickness: 1.6 – 8.0 mm+1L

L = {31.5 + 36 × (N – 1)} –0(N : number of units)

164 min.
Panel thickness: 1.6 – 8.0 mm+1Note 1: Observe at the minimum of 3 cm above and below the units for heat dissipation.
Note 2: No bezel is needed when the panel is cut according to the above drawings.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANL = {31.5 + 36 × (N – 1)} –0(N : number of units)

EM-9437 Rev.11

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48NAV■ USING BEZELS
Bezels are used when the unit needs to be adapted to an existing panel cutout. It is not required when the panel cutout
size is as specified in the unit’s data sheet (31.5 × 138 mm).
Three types of bezels are selectable when ordering.
Standard type: Fits into the 48 Series’ panel		cutout (38 × 139.5 mm)
Option /D type: Fits into DIN panel cutout		(33 × 138 mm)
Option /F type: Fits into Fuji Electric PAJ, PAK, PBA,		etc, panel cutout (44 × 138 mm)
Slide the top and bottom parts of the bezel into the back ofthe front cover as shown below.

■ HOW TO MOUNT THE UNIT ON A PANEL
1) Insert the unit into the panel cutout. The watertightpacking must be in place to hold the unit. Do not remove
it even when the protection is not required.
The IP65 front cover protection is effective only with single mounting, with the designated cutout size (31.5 ×138mm).
PanelBezel
Watertight Packing2) Push the mounting brackets into the grooves on top andbottom of the rear module, until they hit the panel’s rearside.
When multiple units are to be clustered side by side, insert
one bezel between two units as shown below.

Leave at least 3 centimeters both above and below theunit for ventilation.
Bracket• When mounting two or more indicators side by side:

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48NAVTERMINAL CONNECTIONSConnect the unit as in the diagram below or refer to the connection diagram on the side of the unit.

4 *1[.16]■ EXTERNAL DIMENSIONS unit: mm (inch)
16–M3 SCREWTERMINALS

2–M3 SCREWS

12345

137.5 [5.41]

7100 [3.94]

144 [5.67]

689
101112131415
16

36 [1.42]

10 [.39]75 [2.95]

18[.71]103 [4.06]■ STANDARD BEZEL*2■ OPTION /D BEZEL*3

31 [1.22]■ OPTION /F BEZEL*4

11.4[.45]

7.5[.30]

10.4
[.41]

7.5[.30]

10.4[.41]

144 [5.67]

8.5[.33]

136.5 [5.37]

144 [5.67]

3.9[.15]136.5 [5.37]

144 [5.67]

4.9
[.19]

136.5 [5.37]

Rounded corners for the option /D

7.5
[.30]

*1. Space required when replacing the scale plate.
*2. Used for the existing panel cutout of the 48 Series (38 × 139.5 mm).
*3. Used for the existing DIN panel cutout (33 × 138 mm)*4. Used for the existing panel cutout of Fuji Electric PAJ, PAK, PBA (44 × 138 mm), etc.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-9437 Rev.11

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48NAV■ CONNECTION DIAGRAM■ ARARM OUTPUT CODE 2: 2 points+ 1INPUT■ ARARM OUTPUT CODE 4: 4 points

7 Hc– 28 HaINPUT
H OUTPUT+ 17 Hc, HHc– 28 HHa

9 Hb

9 HHb

12 La

10 Ha

13 Lb

12 LLa15 U(+)

13 LLbPOWER

L OUTPUTLL OUTPUT

14 Lc, LLc
15 U(+)
16 V(–)■ Relay Protection• AC Powered

H OUTPUT

11 La

L OUTPUT

14 Lc

16 V(–)HH OUTPUT

POWER• DC Powered
Inductive
Load (Coil)Inductive
Load (Coil)
Varistor or
CR Circuit

LOAD

LOAD

Diode, Varistor or
CR Circuit

UWIRING INSTRUCTIONS■ SCREW TERMINALTorque: 0.6 N·m■ SOLDERLESS TERMINAL
Refer to the drawing below for recommended ring tongue
terminal size. Spade tongue type is also applicable.
Applicable wire size: 0.25 to 1.65 mm2 (AWG 22 to 16)
Recommended manufacturer: Japan Solderless Terminal
MFG.Co.Ltd, Nichifu Co.,ltd

6 (.24) max

3.3 (.13) maxmm (inch)

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-9437 Rev.11

P. 5 / 848NAVFRONT PANEL CONFIGURATION■ ALARM OUTPUT CODE 2: 2 points• Vertical Mounting
50• Horizontal Mounting

100 SETSET (ENTER) Button
H Setpoint409030802010H

H Setpoint Adj. & Trip Indicator (red)70

SSpan Adj. (amber)

60•

Power Saving Mode Indicator (amber)Z

Zero Adj. (amber)

L

L Setpoint Adj. & Trip Indicator (green)050-1040-2030-30

20-40

10-50m3/h

0%

L Setpoint

PV Indicator

H Setpoint

40

M

PV Indicator

HH

HH Setpoint Adj. & Trip Indicator (red)H

H Setpoint Adj. & Trip Indicator (red)Span Adj. (amber)

80

2070

S60

•

Power Saving Mode Indicator (amber)

ZZero Adj. (amber)

L

L Setpoint Adj. & Trip Indicator (green)

LL

LL Setpoint Adj. & Trip Indicator (green)

050-1040-2030-30

20-40

10-50
m3/h

0%0102030

40

50% 0102030

40

50

60

70

80

90

100

•SL

ZHSET• Horizontal Mounting

90

LL Setpoint-10

DOWN Button

3010-20

Mode Selector

100 SET

L Setpoint-30

M

SET (ENTER) Button
HH Setpoint-40

UP Button■ ALARM OUTPUT CODE 4: 4 points• Vertical Mounting
50m3/h -50

m3/h -50-40-30-20-1001020304050% 0102030405060

708090100

•

SM

LLLZH

HHSETUP Button
M

Mode Selector
DOWN Button• Bar Color Patterns
Pattern 1 (Bar LED color code C1)
Input < L

L < Input < H

H < Input
redHLorange

green

green

orangeorangePattern 2 (Bar LED color code C2)
redH
Lorangegreen

redgreenred

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48NAVADJUSTMENT PROCEDURE■ ZERO ADJUSTMENT: Apply 0% input signal before adjustment.
Mode Selector*1 LED Blinking
Zero Adjustment

M

LED OFFZ

SETZ

Complete■ SPAN ADJUSTMENT: Apply 100% input signal before adjustment.
Mode Selector*1 LED Blinking
Span Adjustment

M

LED OFF

S

SETS

Complete■ ALARM SETTING: Proceed after the zero / span adjustments.
Mode Selector*1 LED Blinking
H SetpointM

LED OFF

UP / DOWN Button

H

SETH

Complete

SET

HH

Complete

SETL

Complete

SET

LL

Complete

Increase / Decrease*2 HH Setpoint

M

HHIncrease / Decrease

L Setpoint

MLIncrease / Decrease*2 LL Setpoint

MLL
Increase / Decrease■ POWER SAVING MODE
LED ON

Mode Selector*1 LED BlinkingIndicator OFFM

•

SET•

Complete

LED OFFIndicator ONM

•

SET•

Complete*1. Keep pressing at least for 3 seconds to activate Mode Selector M. Press briefly for second and more times within 1 minute after it has been activated.
*2. HH or LL setpoints are not provided for the 48NAV-2.
Note: Each setting sequence is complete only when SET button is pressed. Once set, parameters are not lost even after the power is removed, except
for the power saving mode. The power saving mode is automatically cancelled when the power is reset.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-9437 Rev.11

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48NAV■ ZERO ADJUSTMENT
1) Apply 0% input signal.
2) Hold down [M] for 3 seconds* and push [M] to choose [Z].
3) Press [SET], and the bargraph shows 0%.
■ SPAN ADJUSTMENT
1) Apply 100% input signal.
2) Hold down [M] for 3 seconds* and push [M] to choose [S].
3) Press [SET], and the bargraph shows 100%.
■ ALARM SETPOINT ADJUSTMENTS•48NAV-2:
H[L setpoint] to 100%			

L			

No alarm trip is selectable

0% to [H setpoint]•48NAV-4:

HH [H setpoint] to 100%			

H[L setpoint] to [HH setpoint]			

L[LL setpoint] to [H setpoint]			

LL

0% to [L setpoint]			

No alarm trip is selectable• How to Set LL (or L, H, HH) Setpoints
1) Hold down [M] for 3 seconds* and push [M] to choose[LL].
2) Press [UP] or [DOWN] buttons until the indicator comesto the desired position, and press [SET].
(Same procedure for L, H, HH setpoints)• How to Cancel HH and H Alarms
1) Press [UP] or [DOWN] buttons until the indicator comesto the upper limit, and press [SET].
HH indicator must be set before H as the H setpoint cannot go above the HH setpoint.
• How to Cancel LL and L Alarms
1) Press [UP] or [DOWN] buttons until the indicator comesto the lower limit, and press [SET].
LL indicator must be set before L as the L setpoint cannot go below the LL setpoint.

CALIBRATION PROCEDURE
This unit is calibrated at the factory to meet the orderedspecifications, therefore you usually do not need any calibration.
For matching the indication to a receiving instrument or incase of regular calibration, adjust the output as explainedin the following.
■ HOW TO CALIBRATE THE OUTPUT INDICATION
Use a signal source and measuring instruments of sufficientaccuracy level. Turn the power supply on and warm up formore than 10 minutes.
1) ZERO: Apply 0% input and adjust bargraph to 0% following the procedure explained in “ADJUSTMENT PROCEDURE.”
2) SPAN: Apply 100% input and adjust bargraph to 100%
following the same procedure.
3) Check ZERO adjustment again with 0% input.
4) When ZERO value is changed, repeat the above procedure 1) – 3).

MAINTENANCE
Regular checking procedure is explained below:■ CHECKING
Warm up the unit for at least 10 minutes. Apply 0%, 25%,50%, 75% and 100% input signal. Check that the bargraphfor the respective input signal remains within accuracy described in the data sheet. When the bargraph is out of tolerance, recalibrate the unit according to the “CALIBRATIONPROCEDURE” explained earlier.

LIGHTNING SURGE PROTECTION
We offer a series of lightning surge protectors for protection against induced lightning surges. Please contact us tochoose appropriate models.

* The [M] button remain activated for 1 minute after it has
been used to choose a indicator LED (programming mode).
During this period, pressing the [M] button briefly is enoughto choose another indicator. After 1 minute, it turns to deactivated state.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-9437 Rev.11

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