PART FOUR - SERVICE AND MAINTENANCE
SECTION 3 - TROUBLESHOOTING
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
Rev. 6-501
94
(green) and Terminal 22 (red) on TB1, with the (+)
lead wire on Terminal 22.
B.
Connect a 1% tolerance, 301 ohm resistor between
Terminals 14 (black) and 16 (yellow) on TB1.
C. Make sure the analyzer is configured for a 300 ohm
NTC temperature element (PART THREE, Section
4.2, “Select TEMP ELEMENT Type”).
For Conventional Combination Electrode
A.
Keep the jumper connected. For analyzers with:
•
“B” prefix serial numbers, jumper is between
Terminals 18 and 20 on TB1.
•
“A” or no letter prefix serial numbers, jumper is
between Terminals 18 and 19 on TB1.
B.
Connect a millivolt generator (or a jumper, if gen-
erator is not available) between Terminal 20
(reference) and Terminal 22 (active) on TB1, with
the (+) lead on Terminal 22.
C. Connect a 1% tolerance, 1000 ohm resistor be-
tween Terminals 14 and 15 on TB1.
D. Make sure the analyzer is configured for a Pt 1000
temperature element (PART THREE, Section 4.2,
“Select TEMP ELEMENT Type”).
3.
Reconnect line power to the analyzer.
WARNING:
LINE POWER IS PRESENT. BE CAREFUL TO
AVOID ELECTRICAL SHOCK.
4.
Set millivolt generator to provide each of the following
outputs, checking the analyzer MEASURE screen each
time for these corresponding pH (or mV) readings:
Corresponding Analyzer Reading
Generator Output
For pH
For ORP
Zero mV
7 pH (approximately)
0 mV
(-)175 mV
10 pH (approximately)
(-)175 mV
(+)175 mV
4 pH (approximately)
(+)175 mV
When Using Jumper Only (not generator)
- - - -
7 pH (approximately)
0 mV
