Myron L D-6 - Manual (Page 38)

• If the pH reading is between 8.0 pH and 6.0 pH, calibrating the
sensor (see pH Calibration, pg. 20) will correct the offset.
7. Press to return the instrument to measurement mode
without changing the calibration of the instrument.
3. pH/ORP
CAuTION: ONLY authorized members of your facility’s maintenance
staff should attempt the following procedures.
The unique pH/ORP sensor in your Dialysate Meter is a nonrefillable
combination type that features a porous liquid junction. It should not be
allowed to dry out. However, if this occurs, the sensor may sometimes
be rejuvenated by first cleaning the sensor well with isopropyl alcohol
or a liquid spray cleaner, such as Windex™ or Fantastic™, and rinsing
well. Do not scrub or wipe the pH/ORP sensor.
Then use one of the following methods:
1.
Pour a HOT salt solution ~60°C/140°F — preferably potassium
chloride (KCI) solution (Myron L pH/ORP Sensor Storage
Solution) but HOT tap water with table salt (NaCl) will work
fine — in the pH/ORP sensor well and allow to cool. Retest.
or
2.
Pour DI water in the pH/ORP sensor well and allow to stand for
no more than 4 hours (longer can deplete the reference
solution and damage the glass bulb). Retest.
If neither method is successful, the sensor must be replaced.
Drifting can be caused by a film on the pH sensor bulb and/or
reference (see Figure 31). Use isopropyl alcohol or spray a liquid
cleaner such as Windex™ or Fantastic™ into the sensor well to clean
it. The sensor bulb is very thin and delicate. Do not scrub or wipe the
pH/ORP sensor.
pH/ORP SENSOR
Top View
ORP
Electrode
pH Glass
Electrode
Sensor
Body
Reference
Junction
under Glass
pH Bulb
Figure 31
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