SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

7.8 HYDROGEN SULFIDE MODULE (5100-05)

7.8.1 DESCRIPTION

Model 5100-05 Hydrogen Sulfide Sensor Module includes a sensor assembly and electronic assembly installed in an explosion proof housing.

The sensor assembly includes a reuseable housing

and disposable electrochemical sensor. The assembly screws into one hub of the sensor module 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 on the electronics assembly.

7.8.2 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

 

 

 

 

Figure 7-9

 

∙ False readings or alarms are received

 

Cover Plate - Hydrogen Sulfide Module

 

 

due to sensor inaccuracy.

 

 

 

 

Warning:

During sensor adjustments the

To make the electrical adjustment connect a voltmeter to

 

concentration reading on the controller will be inaccurate

 

and alarm level concentrations may be displayed. If false

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

 

activation of the alarm relays will cause a problem

potentiometer to adjust the voltage based on the

 

disconnect the relay wiring prior to adjustment or turn the

following:

 

module off using the "Change Module" mode.

∙ 1 ppm H2S = 0.02 VDC.

 

 

 

 

 

 

NOTE

Although all the necessary data can be collected with a

voltmeter at the sensor module, some helpful

information can be displayed on the controller or printed. See diagnostic codes 0004 and 0008 in Appendix C.

7.8.3 ADJUSTMENT PROCEDURE

Prior to reading voltages and making adjustments perform a visual inspection to confirm that there are no physical problems such as water in the electronics enclosure, wiring damage or corrosion.

Use Figure 7-9 to locate test points during the following procedures.

7.8.3.1 SIGNAL ADJUSTMENT

It is unlikely that any electrical adjustment will be required except when a new sensor is installed.

∙100 ppm H2S = 2.00 VDC.

7.8.3.2SENSOR REPLACEMENT

The Hydrogen Sulfide sensor should be replaced when it can no longer be calibrated correctly. Generally this is every twenty four to thirty months.

The SENSOR FAILURE message for Hydrogen Sulfide sensors does not indicate a specific failure of the sensor but indicates that the sensor is not correctly connected to the electronics. If this message appears check that the sensor harness is correctly installed to the connector on the bottom electronics board.

The gas sensor which is located inside the sensor assembly housing can be replaced without replacement of the housing. To replace the sensor:

SERVICE Page: 76

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Sentry Industries 5000 instruction manual Cover Plate Hydrogen Sulfide Module, Hydrogen Sulfide Module Description
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5000 specifications

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