HF scientific DRT-15CE Portable Turbidimeter - Manual (Page 17)

DRT-15CE (5/10) Page 9
8.0 TROUBLE SHOOTING
Symptom
Meter does not respond when a sample is set into the well.
Possible Cause
1. Lamp is burned out. Replace the lamp and recalibrate.
2. Printed Circuit Board failure. Replace Printed Circuit Board.
3. Battery is low. Charge battery.
In the case of 1 or 2 the in strument should be recalibrated. The lamp has an
extraordinary long life and therefore replace ment is infrequent.
Symptom
Reference Adjust does not have enough travel to adjust for the calibration
standard value.
Possible Cause
1. Scratched or rubbed calibration standard container or aged calibration
standard. Replace the standard.
2. Optics have aged. Recalibrate.
3. Faulty lamp. Replace the lamp and recalibrate.
Symptom
The display will not stabilize with the calibration standard in the well.
Possible Cause
1. Battery voltage too low. "BAT" indicator is "ON" when the battery
requires recharging. When the battery is dis charged, the voltage will
drop off causing the meter display to drift. Recharge battery.
2. Cold sample can cause condensation on the cuvette. Clean and dry
cuvette.
3. Unit has not been given suf ficient time to stabilize at ambient
temperature. Allow time for instrument to stabilize.