RANGE ADJ

SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

7.4HYDROGEN SULFIDE MODULE (5100-01)

7.4.1DESCRIPTION

The Hydrogen Sulfide Sensor 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.

When a sensor is changed it is important that the factors for the new sensor are keyed into the controller and that a 24 hour stabilization period elapses prior to voltage adjustments and calibration. The three factors, each three digits are written on the sensor connector label.

7.4.2TROUBLE ANALYSIS

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

Controller displays the error messages:

CHECK POWER ADJ

SENSOR FAILURE

LOW SENSITIVITY

False readings or alarms are received due to sensor inaccuracy.

Figure 7-5

Cover Plate - Hydrogen Sulfide Sensor Module

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.

Note:

Although all the necessary data can be collected with a

voltmeter at the sensor module, some helpful

information can be displayed or printed. See diagnostic

codes 0004 and 0008, Appendix C.

7.4.3 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.

7.4.3.1 POWER ADJUSTMENT

Comparing to the GND (ground) test point measure the HEATER VOL (heater voltage) and the HEATER CUR (heater current) values in VDC. Calculate the power by the formula: (HEATER CUR - HEATER VOL) * HEATER VOL / 5.1. The correct value is 400Mw +/- 5 Mw. (Note that this calculation is performed by the controller and displayed using diagnostic code 0004.) See Table 7-4 for corresponding voltage and current settings.

Adjust the heater power using HEATER ADJ potentiometer, turn clockwise to decrease, counter-clockwise to increase the power. Make the adjustments 1/4 turn at a time and wait for the values to stabilize before making successive adjustments.

7.4.3.2 MODULE ADJUSTMENT

Use Figure 7-5 to locate test points during the following procedures.

Compare ground to SIGNAL OUT to read the module voltage. The beginning (no gas) value must be above 1.2 VDC and can be up to 7.5 VDC. If the no gas voltage is lower than 1.2 VDC adjust using potentiometer.

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Sentry Industries 5000 instruction manual Cover Plate Hydrogen Sulfide Sensor Module

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