4210 Flow Meter
Section 4 Optional Equipment
4-14
Flow streams with a high grease content will coat the sensing
surfaces of the probe quickly, clogging them and slowing the
response time or stopping it altogether. Installation in very
greasy flow streams is not recommended.
To calibrate the pH probe with the flow meter:
1. Go to program Step 1: PROGRAM, SETUP and select
PROGRAM.
2. Step through the units of measure with the Enter key
until you reach the menu that says pH UNITS - NOT
MEASURED, pH. Select pH. You must do this in step 1 or
the pH menu will not appear later.
3. Now go to step 3. PARAMETER TO ADJUST - NONE,
LEVEL, pH (other selections may appear.) and select pH. If
the pH menu does not appear in step 3, go back to step 1 to
make sure you have turned it on. Then the pH selection of
calibrations will appear.
4. If you select 4 & 7, the following screen will appear. Cali-
bration with the other menu options (7 & 10 or 4, 7, & 10)
is essentially the same as shown below. For the other
menus, see Section 2.
5. When the probe has stabilized, press Enter and the follow-
ing display will appear:
When you have entered this second value, the pH probe
calibration is complete. You can then install the probe in
the flow stream.
4.10.3 pH Probe Installation
Guidelines
Installation of the pH probe is similar to the submerged level
sensor, other parameter probes, and the area-velocity sensor.
• Install the probe only in streams that have continuous
flow. The sensing end of the probe must always remain
wet.
• For proper operation, there must also be enough flow to
submerge the sensing end of the probe completely.
If flow in the stream is intermittent (dry for periods of time), the
pH sensing bulb will dry out and its response time will slow. This
is a problem in situations where pH changes rapidly. If the probe
is dry long enough, it will first lose sensitivity, then be slow to
respond, and finally be ruined. Never let the sensing end of
the probe dry out completely.
• Installation in streams with high grease content will
result in poor performance and require frequent
cleaning and recalibration.
RINSE PROBE AND PLACE IN 7.0 pH SOLUTION
PRESS ENTER WHEN STABLE: X.XX pH
RINSE PROBE AND PLACE IN 4.0 pH SOLUTION
PRESS ENTER WHEN STABLE: X.XX pH
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