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 TM 55-1905-223-24-18-1
WARNING
Exercise extreme care while working on
electrical components inside control module.
Accidental contact with energized components
may result in injury to personnel or equip-
ment damage.
(2) Hold alarm set switch (2) in SET.
(3) Turn alarm set point adjustment screw (3) until desired reading is obtained
o n digital display (4). Desired reading is indicated by calibration number
(4).
(4) Perform system start up as detailed in TM 55-1905-223-10 (Operator's
Manual).
(5) Run clean water having a zero ppm value through sensing module.
(6) Attach leads of test meter to terminal contacts 27(+) and 28(-) of control
module (6).
(7) When conditions have stabilized, a reading of 0 Vdc should be obtained.
See Table 2-5.
Control Module Output Voltage for ppm.
Output Voltage (dc volts)
ppm Indication (ppm)
10
100
5
50
1
10
5
0.5
0
0
(8) Release and swing aside Receive (REC) and Digital Voltmeter (DVM)
adjustment guard (7).
(9) Calibrate output as indicated above by adjusting recorder adjustment screw
(8) for 10 ppm.
(10) Adjust digital voltmeter (DVM) adjustment screw (9) to 1 Vdc value on
d i g i t a l display (4). Unit is now calibration to read ppm.
(11) Reinstall REC and DVM adjustment guard (7) in original position.
2-233
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