RKI Instruments 65-2442RK - Manual (Page 18)

14 • 65-2442RK PPM Hydrogen Transmitter
9. Measure the voltage between the B terminal on the detector terminal strip and the -
(negative) terminal on the controller terminal strip as shown below in Figure 4.
Figure 4: Load Voltage Measurement
10. Adjust the load voltage adjust pot until the load voltage is 5.0 V ± 0.1 V.
11. Turn the regulator knob clockwise to close the regulator.
12. Unscrew the regulator from the calibration cylinder.
13. Unscrew the calibration cup from the detector
NOTE: For convenience, leave the regulator and calibration cup connected by the
humidifier tube.
14. Re-install the amplifier to the housing using the screw, flat washer, and lock washer
removed in Step 5 above.
15. Calibrate the ppm hydrogen transmitter as described in “Calibration” on page 15.
16. Verify that the controller display reading decreases and stabilizes at 0 ppm.
17. Store the components of the calibration kit in a safe and convenient place.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all ppm hydrogen
transmitter applications, a calibration frequency of every 6 to 12 months is adequate for
most applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 6 months.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where hydrogen is not normally present, and calibration
adjustments are minimal at calibration, then a calibration frequency of every 12 months is
adequate.
If an application is very demanding, for example if hydrogen is present often and in
significant concentrations or the environment is not well controlled, then more frequent
calibration than every 6 months may be necessary.
Digital
Voltmeter
+
NOTE: Detector and Controller Wires Not Shown
Measure Load Voltage
Between B and -
Controller Terminal Strip
Detector Terminal Strip
SP
A
N
ZE
R
O
P
W
R / S
IG
S
WB
R
D
E
TE
C
T
O
R
1-
2
H
e
x
3-
4
H
2
G
a
s
S
e
le
c
t
1 3 4 2