SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

7.10 AMMONIA SENSOR MODULE (5100-25)

7.10.1 DESCRIPTION

The Ammonia Sensor Module includes a sensor assembly and electronic assembly installed in an explosion proof housing.

The sensor assembly includes a rechargeable 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.

7.10.2 TROUBLE ANALYSIS

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

∙Controller displays the following error messages

 

 

 

 

SENSOR FAILURE

 

 

 

 

 

 

 

 

 

 

 

LOW SENSITIVITY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 7-13

 

∙

False

readings

or alarms are received

 

 

 

 

due to sensor inaccuracy.

 

 

 

 

 

Cover Plate - Ammonia Module

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Warning:

During sensor

adjustments

the

 

 

 

concentration reading on the

controller will

be

 

To make the electrical adjustment connect a voltmeter to

inaccurate

and

alarm

level

concentrations

may

be

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

displayed.

If false activation

of

the alarm relays will

potentiometer to adjust the voltage based on the

cause a

problem disconnect the

relay wiring prior

to

following:

adjustment or turn the module off using the "Change

 

1% of full scale = 0.02 VDC.

Module" mode.

 

 

 

 

 

 

 

 

∙

 

 

 

 

 

 

 

 

 

 

 

 

∙ 100% of full scale = 2.00 VDC.

 

 

 

 

 

NOTE

 

 

 

 

 

 

 

Although all the necessary data can be collected with a

 

 

 

 

 

 

 

voltmeter at the sensor module, some helpful

 

 

7.10.3.2

SENSOR RECHARGE

 

 

information can be displayed on the controller or

 

 

 

 

 

 

 

 

 

 

printed. See diagnostic codes 0004 and 0008 in

 

 

The Ammonia sensor can be recharged by removing it

 

 

 

 

Appendix C.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

from service, draining electrolyte, cleaning electrodes and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7.10.3 ADJUSTMENT PROCEDURE

 

 

 

 

replacing the electrolyte and membrane.

 

 

 

 

 

 

Prior to reading voltages and making adjustments perform

Step by step instructions for sensor recharge are supplied

with the recharge kit.

a visual inspection to confirm that there are no physical

 

 

problems such as water in the electronics enclosure,

 

 

wiring damage or corrosion.

 

 

 

 

 

 

7.10.3.3

SENSOR REPLACEMENT

Use Figure 7-13 to locate test points during the following

The Ammonia sensor assembly should be replaced when it

procedures.

 

 

 

 

 

 

 

 

can no longer be recharged and calibrated correctly.

7.10.3.1

SIGNAL ADJUSTMENT

 

 

 

 

 

 

 

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

SERVICE

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Sentry Industries 5000 instruction manual Cover Plate Ammonia Module, Ammonia Sensor Module Description, Sensor Recharge
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