14
SENSOR PREP
ARA
TION & INST
ALLA
TION
For reducing pretreatment:
immerse the electrode for at least five minutes in
HI7091
.
For oxidizing pretreatment:
immerse the electrode for at least five minutes in
HI7092
.
pH
mV
pH
mV
pH
mV
pH
mV
pH
mV
0
990
1
920
2
860
3
800
4
740
5
680
6
640
7
580
8
520
9
460
10
400
11
340
12
280
13
220
14
160
5.3. SENSOR INSTALLATION
The
HI7698195
probe sensor connector sockets are identified with color-coded triangles:
• CONN1 - red connector (one triangle): pH or pH/ORP sensor
• CONN2 - blue connector (two triangles): EC sensor
6
7
2
1
3
4
5
8
1. Sensor sockets
2. EC/TDS/Salinity/Resistivity sensor
3. Temperature sensor
4. pH sensor
5. pH/ORP combination sensor
6. Strain relief
7. Probe body
8. Protective shield
To install the sensors follow the steps below:
1. Remove the protective shield from the probe and set it aside.
2. Use the supplied silicone grease sachet and sparingly lubricate the o-ring with a thin film of the
grease. Do not substitute other grease or lubricants as it may cause the o-ring to swell.
3. Insert the sensor into the correctly color-coded opening while positioning the connector key
toward the center of the probe. Make sure the connector is seated correctly (the sensor will no
longer move freely) before tightening the locking threads with your fingers.
