Maintenance – RKI Instruments 35-3000RKA-10 User Manual
Page 14
14 • 35-3000RK-10 PPM Hexane Sample Draw Detector
1.
Verify that the sample draw detector is sampling a fresh air environment
(environment known to be free of combustible gas).
2.
Open the housing door.
3.
Set a voltmeter to measure in the millivolt (mV) range.
4.
Plug the voltmeter leads into the test points on the amplifier. Plug the positive lead
into the red + test point; plug the negative lead into the black - test point.
5.
Verify a voltmeter reading of 100 mV (± 2 mV).
6.
If necessary, use a small flat-blade screwdriver to adjust the zero pot until the
voltmeter reading is 100 mV (± 2 mV).
7.
Remove the voltmeter leads from the test points.
8.
Close the housing door.
Maintenance
This section describes maintenance procedures. It includes preventive maintenance
procedures. This section also includes procedures to troubleshoot the sample draw
detector, replace components of the sample draw detector, adjust the low flow setting, and
set the load voltage.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure optimum sample
draw detector performance. It includes daily, monthly, and quarterly procedures.
Daily
1.
Verify that the pilot LED is on.
2.
Verify that the flowmeter indicates a flow rate of approximately 1.5 SCFH. If
necessary use the bypass valve or flow adjust pot to adjust the flow rate to 1.5 SCFH.
3.
Verify a reading of 0 ppm (4 mA) at the monitoring device or a reading of 100 mV at
the transmitter test points. Investigate significant changes in the reading.
Monthly
This procedure describes a test to verify that the sample draw detector responds properly
to the target gas.
NOTE:
To reduce the response time of this test, use a short incoming sample line. If the
sample draw detector’s sample line is long, connect a shorter line for this test.
Make sure you reconnect the sample line after you complete this procedure.
NOTE:
Performing a response test on the sample draw detector may cause alarms. Be
sure to put the controller into its calibration program or disable external alarms
before performing this test.