Maintenance – RKI Instruments GD-K7D2 (24 VDC) User Manual
Page 18
14 • Model GD-K7D2 (24 VDC) Sample Draw Transmitter
Maintenance
This section describes maintenance procedures for the GD-K7D2. It includes preventive
maintenance and troubleshooting procedures.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum
performance of the GD-K7D2. It includes daily, monthly, and quarterly procedures.
Daily
1.
Verify that the flow light on the front of the GD-K7D2 is on. If it is off, see the
Troubleshooting section below.
2.
Verify that the flowmeter ball is between the two lines on the flowmeter. If necessary,
use the flow rate potentiometer to adjust the flow rate, so the flowmeter ball is
between the two lines.
3.
Verify a display reading of 0 at the controller. Investigate significant changes in the
display reading.
Monthly
NOTE: Verifying the response of the GD-K7D2 may cause alarms. Be sure to put the
controller into it’s calibration program or disable external alarms before
verification.
This procedure describes a test to verify that the GD-K7D2 responds properly to the target
gas.
Preparing for the response test
1.
Verify that the display reading for the channel you plan to test is 0.
If the display reading is not 0, set the zero reading of the GD-K7D2 as described in the
Start Up section of this manual, then continue this procedure.
2.
Assemble the calibration kit as described in the Calibration section of this manual.
NOTE:
Do not connect the tubing from the GD-K7D2’s gas in fitting to the regulator at
this time.
3.
Loosen the thumbscrew on the front of the cover, then remove the cover from the
detection unit and installation bracket.
4.
Use small test clips to connect a milliampmeter to the output check pins.
5.
Use the following formula to determine the correct GD-K7D2 (response) output for
the calibrating sample.
Response Output (mA) = (calibrating gas/fullscale) X 16 + 4
For example, if you have a cylinder of 5 ppm calibration gas with a GD-K7D2 full
scale of 10 ppm:
12 mA = (5 ppm/10 ppm) X 16 + 4