MANUALPC-2010 CHAPTER VI – MAINTENANCE Page 58
PORTABLE TESTER
The PORTA-PROBE
TM
II (Error! Reference source not
found.) is a battery-operated digital portable tester/signal
generator. It is designed to test the ORP, pH, conductivity and
temperature sensors and to generate calibrated signals to test
the controller. It is supplied with a 9V battery and a pair of
shielded cables with BNC connectors.
The PORTA-PROBE
TM
II is not used to calibrate the ORP and
pH sensors. This should be done with a chemical test kit, such
as DPD for Free Chlorine and Phenol Red for pH.
ORP SENSOR TESTING
S
et the Mode Switch to TESTING. Connect the ORP sensor to
the ORP BNC connector on the tester. Turn the Selector Knob
to ORP.
Place the sensor in balanced water (pH = 7.5 / PPM = 1.0 Cl).
You should get an ORP reading within 650 to 750 mV.
Place the sensor in an acid solution. You should get a HIGH
POSITIVE reading.
Place the sensor in a BLEACH (liquid chlorine) solution. You
should get a LOW POSITIVE reading.
pH SENSOR TESTING
The PORTA-PROBE
TM
II shows actual pH sensor readings in
millivolts, as shown on the Table on the right.
Set the Mode Switch to TESTING. Connect the pH sensor to
the pH BNC connector on the tester. Turn the Selector Knob
to pH.
Place the pH sensor in nearly neutral water (pH = 7.5). You
should get a pH reading of about -30 mV.
Place the sensor in an acid solution. You should get a HIGH
POSITIVE reading.
Place the sensor in a BLEACH solution. You should get a
HIGH NEGATIVE reading.
The pH scale on the right shows the conversion of millivolt
readings into pH units.
ORP AND pH SIMULATION
Set the Mode Switch to SIMULATOR.
Use the two coaxial cables to connect the BNC connectors on
the tester to the respective BNC connectors on the controller.
Set the Selector Knob to either pH or ORP Simulator. The
readings on the controller should match the readings of the
tester display (unless offset by calibration of the pH probe).
CONDUCTIVITY AND TEMPERATURE
Connect the respective sensors and controller inputs to the
connectors as indicated on the portable tester.
Figure 44 - PORTA-PROBE
TM
Portable Tester
The outputs of the ORP and pH simulators can be adjusted
with the two small knobs located below the digital display. The
ORP range is 0 to 1,000 mV.. The pH range is -180 to + 180
mV (10 to 4 on the pH scale). These outputs can be used to
test for proper operation of the feed and alarm features of the
controller.
NOTE 1: Due to signal stabilization, the readings on the
controller may take up to 10 seconds to reach full value.
NOTE 2: ORP and pH signals can be generated
simultaneously but only one signal is displayed.
pH Scale
mV pH
+420 0
+30 6.5
0 7.0
-6 7.1
-12 7.2
-18 7.3
-24 7.4
-30 7.5
-60 8.0
-90 8.5
-420 14.0
Figure 45 - pH / mV Scale
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