SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

7.7 CARBON MONOXIDE MODULE (5100-04)

7.7.1 DESCRIPTION

The Carbon Monoxide 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 from the controller connects to a three pin spring loaded terminal strip.

7.7.2 TROUBLE ANALYSIS

Electrical adjustment, or replacement of the sensor

 

will be necessary under the following conditions:

 

∙ Controller displays the following error

 

messages

 

 

 

 

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 7-8

inaccurate and alarm level concentrations may be

Cover Plate - Carbon Monoxide 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

 

the "Change Module" mode.

∙ 1 ppm CO = 0.004 VDC.

 

 

 

 

∙ 100 ppm CO = 0.40 VDC.

 

 

Note

 

 

 

Although all the necessary data can be collected with a

 

∙ 250 ppm CO = 1.00 VDC.

 

 

voltmeter at the sensor module, some helpful

 

 

 

 

 

 

 

information can be displayed on the controller or

 

 

 

 

printed. See diagnostic codes 0004 and 0008 in

 

7.7.3.2 SENSOR REPLACEMENT

 

 

Appendix C.

 

 

 

 

 

 

 

 

 

The carbon monoxide sensor should be replaced when it

7.7.3 ADJUSTMENT PROCEDURE

can no longer be calibrated correctly.

Generally this is

Prior to reading voltages and making adjustments perform

every twenty four to thirty months.

 

 

 

a visual inspection to confirm that there are no physical

The "SENSOR FAILURE" message for Carbon

problems such as water in the electronics enclosure,

Monoxide sensors does not indicate a specific failure of

wiring damage or corrosion.

the sensor but indicates that the sensor is not correctly

Use Figure 7-8 to locate test points during the following

connected to the electronics. If this

message appears

 

 

procedures.

check that the sensor harness is correctly installed to the

connector on the bottom electronics board.

 

7.7.3.1 SIGNAL ADJUSTMENT

 

 

It is unlikely that any electrical adjustment will be

 

 

required except when a new sensor is installed.

 

 

To make the electrical adjustment connect a voltmeter to

 

 

SIGNAL OUT (pos) and GND (ground) and use

 

 

SENSITIVITY ADJ potentiometer to adjust the voltage

 

 

based on the following:

 

 

 

 

 

SERVICE

Page: 74

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Sentry Industries 5000 instruction manual Cover Plate Carbon Monoxide Module, Carbon Monoxide Module Description
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5000 specifications

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