Rev. 6-501
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
5
CONDENSED OPERATING INSTRUCTIONS
This manual contains details for all operating aspects of the instrument. The following con-
densed instructions are provided to assist you in getting the instrument started up and
operating as quickly as possible.
These condensed instructions only pertain to basic pH
measurement operation using a GLI Differential pH sensor.
To measure ORP, use a con-
ventional combination electrode or use specific features of the instrument, refer to the
appropriate sections in this manual for instructions.
A. CONNECTING SENSOR/CONFIGURING SENSOR TYPE AND TEMPERATURE ELEMENT
1. After properly mounting the analyzer (PART TWO, Section 2), connect the GLI Differ-
ential Technique pH sensor, matching wire colors to terminals as indicated:
Sensor
Wire Colors
Analyzers with
“B” Prefix Serial No.
Analyzers with
“A” or No Letter Prefix Serial No.
White
Terminal #13 on TB1
Terminal #13 on TB1
Black
Terminal #14 on TB1
Terminal #14 on TB1
Yellow
Terminal #16 on TB1
Terminal #16 on TB1
Shield
Terminal #18 on TB1
Terminal #11 on TB1
Green
Terminal #20 on TB1
Terminal #20 on TB1
Red
Terminal #22 on TB1
Terminal #22 on TB1
2. The analyzer is factory-set to use a GLI Differential Technique pH sensor. To use a
conventional combination electrode, you must change the sensor type (see PART
THREE, Section 4.2, subheading “SELECT SENSOR Type”).
3. The analyzer is factory-set for automatic temperature compensation using the NTC 300
ohm temperature element built into all GLI Differential sensors (except GLI’s pure water
pH sensor system 6006P4-2000 which uses a Pt 1000 RTD). When you want fixed
MANUAL temperature compensation or if you are using a sensor with a different tem-
perature element, you must change the temperature element type (see PART THREE,
Section 4.2, subheading “Select TEMP ELEMENT Type”).
B. CONNECTING LINE POWER
Important:
Follow instructions in PART TWO, Section 3.7 to connect line power to the analyzer.
C. ADJUSTING DISPLAY CONTRAST
Ambient lighting conditions may make it necessary to adjust display contrast to improve
visibility. With the MEASURE screen displayed, press and hold the
ENTER key
and
simultaneously press the
×
×
or
Ø
Ø
key
until attaining the desired contrast.
D. CONFIGURING BUFFER TYPE/CALIBRATING THE ANALYZER
The analyzer must be calibrated so that measured values will correspond to actual process
values. Before calibrating for the first t ime, select the buffer set you intend to use. Then,
calibrate using the recommended “2 POINT BUFFER” method which provides the most ac-
curate pH measurements.
1. The analyzer is factory-set for the common 4.00, 7.00, and 10.00 pH buffer set. For
DIN 19267 standard value buffers you must change the buffer set (see PART THREE,
(continued on next page)
NOTE:
For GLI Differential
sensors that have two
shield wires, always
connect the outer
shield to an earth
ground terminal and
the inner shield to the
“shield” terminal.
