SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

7.5COMBUSTIBLE GAS SENSOR MODULE (5100-02)

7.5.1 DESCRIPTION

The Combustible Gas Module includes the sensor and electronic assembly installed in an explosion proof housing. The sensor screws into one hub of the enclosure and plugs into the bottom electronics card via a six pin connector. Cabling to the controller connects to a three pin spring loaded terminal strip.

7.5.2 TROUBLE ANALYSIS

Electrical adjustment, or replacement of the sensor will be necessary under the following conditions:

Controller displays the following error messages:

CHK BRIDGE VOLT

SENSOR FAILURE

LOW SENSITIVITY

False readings or alarms are received due to sensor inaccuracy.

Warning:

: During sensor adjustments the

 

 

concentration reading on the controller will be

 

Figure 7-6

 

inaccurate and alarm level concentrations may be

Cover Plate - Combustible Gas Module

 

displayed. If false activation of the alarm relays

 

 

will cause a problem disconnect the relay wiring

 

 

 

prior to adjustment or turn the module off using

Comparing to the "GND" (ground) test

point measure

the CHANGE MODULE mode.

"BRIDGE VOL" (bridge voltage) and adjust to 2.00 VDC

 

 

 

 

 

 

 

NOTE

 

using "BRIDGE ADJ" potentiometer.

Turn counter-

 

Although all the necessary data can be collected with a

 

clockwise to increase.

 

 

 

voltmeter at the sensor module, some helpful

 

 

 

 

information can be displayed or printed. See diagnostic

 

7.5.3.2 ZERO ADJUSTMENT

 

 

 

codes 0004 and 0008 in Appendix C.

 

 

 

 

 

 

 

Comparing to ground measure SIGNAL OUT and adjust to

7.5.3 ADJUSTMENT PROCEDURE

0.18 VDC by turning ZERO ADJ potentiometer. Turn

Prior to reading voltages and making adjustments perform

counter clock-wise to increase.

 

a visual inspection to confirm that there are no physical

 

 

problems

such as water in the electronics enclosure,

7.5.3.3 SPAN ADJUSTMENT

 

wiring damage or corrosion.

 

1. Determine the concentration of the calibration

Use Figure 7-6 to locate test points during the following

gas (CG) in % LEL.

 

procedures:

2. Use the following formula to determine the

Caution:

The area must be free of flammable vapors or

response to the calibration gas at SIGNAL OUT.

gases during any adjustments or maintenance procedures.

Voltage (Signal Out) = (CG+12)/60

 

 

 

 

 

7.5.3.1 BRIDGE VOLTAGE ADJUSTMENT

Confirm that no combustible gas is present and remove sensor module cover.

For Example:

If CG = 50% L.E.L

Signal Out= (50+12)/60

= 1.03 volts

SERVICE Page: 69

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Sentry Industries 5000 Cover Plate Combustible Gas Module, Combustible GAS Sensor Module Description, Zero Adjustment

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