HF scientific MicroTSCM Streaming Current Monitor - Manual (Page 18)

MICROTSCM (07/09) Page 14
REV 2.4
6.0 Calibration
The MicroTSCM has been calibrated at the factory, however to ensure accuracy it is
recommended that the instrument be calibrated prior to being placed online. Long term
drift may occur in this instrument and HF scientific recommends calibration every three
months.
To facilitate the initial calibration, a calibration kit, Part # 19922 is supplied with this
instrument. When prepared according to the included instructions a +5.30 SCU Cationic
calibration solution is produced. Allow this solution to stand for one hour prior to use.
In preparation for calibration ensure that previously operated sensors are rinsed with, and
then operated in, clean water, for several minutes.
6.1 Calibration Procedures
Place the sensor in the Cationic Standard and allow it to stand for about 15 minutes.
Ensure that the gain switch is set to OFF. See section 8.1
On the Analyzer ensure that the Offset Level is set to 0.00 and the signal averaging is
turned OFF. To calibrate, on the Analyzer, go to Sensor Setup → Extended Setup → Full
Scale Cal. → Cal Time. The S key will initiate the calibration, which will take 60
seconds.
At the completion of the calibration, ensure that the reading is +5.10 to +5.50 SCU. If the
reading appears unstable initiate another calibration. If the +5.30 SCU calibration value is
not achievable, refer to section 6.2.
Rinse the sensor with clean water prior to returning to service.
As a check, an Anionic solution can be made using a 100mg/l dishwater detergent
solution. An acceptable reading would be -4.0 to -6.0 SCU.
Note: Do not attempt to calibrate on an Anionic solution.
6.2 EEPROM Programming Correction
If the calibration in the Cationic solution does not achieve a reading of +5.10 to +5.50
SCU, the EEPROM has probably lost the storage value and will need to be reprogrammed.
This will need to be performed at the sensor while operating in the calibration solution.
Remove the sensor cover by loosening the four corner captive fasteners. Inside locate a
small DIP switch with four white sliders labeled SW4. Above this switch are two push
buttons labeled SW2 and SW3. On the DIP switch flip the slider labeled 3 up. The
analyzer should display +5.30. If it does not adjust the value with the push buttons; SW2
will increase the value (UP) SW3 will decrease the value (DOWN). Adjust until the
Analyzer reads exactly +5.30 SCU. Flip the slider on the DIP switch down to store the
adjustment.
Attempt another calibration from the Analyzer as in section 6.1. If the correct calibration
values are still not achievable, call HF scientific Technical Service Department for
assistance.