SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

7.6 OXYGEN MODULE (5100-03)

7.6.1 DESCRIPTION

The Oxygen Module includes the electronic assembly installed in an explosion proof housing and the electrochemical sensor connected to one hub of the enclosure. Cabling from the controller connects to a three pin spring loaded terminal strip.

7.6.2 TROUBLE ANALYSIS

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

∙Controller displays the following error messages:

CHANGE SENSOR

SENSOR FAILURE

REPLACE SENSOR

∙False readings or alarms are received due to sensor inaccuracy.

Warning: During sensor adjustments the concentration reading on the controller will be inaccurate and alarm level concentrations may be 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.

Figure 7-7

Cover Plate - Oxygen Module

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.

7.6.3 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 7-7 to locate test points during the following procedures.

7.6.3.1 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 set the voltage equal to 1/10 of the actual oxygen concentration. In clean air the concentration is 20.9% so the voltage should be set at 2.09 VDC.

7.6.4 SENSOR REPLACEMENT

The oxygen sensor should be replaced when it can no longer be calibrated correctly or when the signal output drops to zero. Generally this is every twelve to eighteen months. The Sentry clock keeps track of the age of the sensor if it is correctly initialized in the "change module" mode.

When a new sensor is installed use the CHANGE MODULE menu selection to answer yes to the "new sensor?" question. After nine months the CHANGE SENSOR message will be displayed to warn that a new sensor should be installed.

The SENSOR FAILURE message for Oxygen 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.

When sensor replacement is required, open the cover of the sensor module, remove the transmitter and disconnect the sensor wiring harness from the back of the transmitter.

SERVICE Page: 72

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Sentry Industries 5000 instruction manual Cover Plate Oxygen Module, Signal Adjustment
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5000 specifications

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