OxyTechw² GAL Instruction Manual
7. The “SET CAL” screen will be displayed. Using the arrow keys set
the temperature value the same as is displayed on your temperature
reference tool. Press
to accept. The Calibration screen will now
be displayed.
8. Wait for the value to stabilise
(The digits should not be changing),
then press
to accept.
The temperature calibration is now complete.
9.2 OxyTechw² GAL
The OxyTech2² GAL sensor is very stable and will maintain its calibration for extended periods of time,
the primary reason for a change in the calibration is the presence of a bio-film on the membrane. The
design of the sensor means that zero point testing is not required. We recommend that calibration is
carried out during commissioning and is then checked after one weeks operation. Following this
calibration should be carried out after 3 months. At this time ongoing calibration frequency can be
determined. This would normally be every 6 months.
9.2.1 Zero Calibration (Service Mode Only)
NOTE:
This is the only advanced
SERVICE
Mode function shown in this manual.
This option will not be available unless 'Service Mode' is set on the 7300 monitor. Therefore, a zero
calibration is NOT generally required for the OxyTech2² GAL sensor as this has been done in the
factory.
The zero value used is a true electrical zero and is achieved without any electrolyte present in the
sensor. If during sensor refurbishment it is connected to the 7300 monitor without the electrolyte filling
solution present, the reading displayed will check the integrity of the sensor and whether there has
been water ingress into the electrode or cable assembly. If there is a positive reading of 1% or more,
then the sensor should be discarded and replaced as water ingress has occurred.
If an electrical zero calibration is required then the following should be adopted.
The sensor will be dismantled with no electrolyte present. The internal anode
should be clean and dry. (See sensor refurbishment below for details)
Enable 'Service Mode' . (See 7300w² instruction Manual)
From the 7300w² Monitor, navigate to the Calibration menu as follows-
1. Press
to show the “MAIN MENU”.
2. Select “MEASUREMENT CONFIG” by pressing
and press
.
3. Select “DISSOLVED OXYGEN” by pressing
and press
.
NOTE: This will be the first DISSOLCED OXYGEN option as the
second relates to mg/l solubility, and there is no calibration option for
this measurement.
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M:03 SET CAL (25.0 ºC)
25.0 ºC
Use to set value
Press OK to accept
Press MENU to cancel
M:03 SET CAL (25.0 ºC)
Insert sensor into calibration
solution and wait for measurement
to stabilise
Press OK to contiue or MENU to Exit
24.9
ºC
SM M:01 CONFIG
M:01 Info
M:01 Title
M:01 Set Cal (0.0 %SAT)
M:01 Averaging
M:01 Remove
M:01 Display Position
M:01 Set Cal (100.0 %SAT)
SM MEASUREMENT CONFIG
Measurement Status
Add Measurement
M:01 Dissolved Oxygen (S:01)
M:02 Dissolved Oxygen (S:01)
M:03 Temperature (S:01)
M:04 Dissolved Oxygen (S:01)
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