Section 6
Troubleshootiing and functional checks
6.1 Troubleshooting
Fault
Possible Cause
Action
No Display
Battery failure
Replace battery
Use optional Power supply
(See section 5 for correct voltage)
Drifting erratic readings
Electrode fault
Use BNC cap to test 3505 (see 7.2)
Replace electrode
Cannot calibrate
Electrode Fault
Use BNC cap to test 3505 (see 7.2)
Replace electrode
Temperature readings
Temp probe faulty
Check 3505 using section 7.2
fluctuating
Replace temperature probe
Temperature readings
Temp probe faulty
Check 3505 using section 7.2
incorrect
Replace temperature probe
Manual temp not set
Set meter to read °C and set
temperature against a calibrated
thermometer
Slope/Buffer controls
3505 incorrectly set
Set Dial to pH Cal
not working
Battery symbol is displayed Battery running out
Less than 8hrs lifetime left - replace
battery
If the above does not answer your query try the FAQ section on the
www.Jenway.com
Website.
6.2 Functional check
The measurement function of the meter can be checked using the enclosed BNC shorting cap
(009 146).
1) Remove the ATC probe if connected.
2) Set Manual temperature compensation to 25°C using the Dial on the 3505
3) Remove pH probe and replace with BNC shorting cap.
4) Set the meter to pH cal and adjust Buffer control to read 7.00.
If this cannot be set to 7.00 please contact the manufacturer or you local distributor.
To make measurements from this point refit the ATC probe and pH probe and calibrate the 3505
using fresh buffer solutions (see section 3.6).
350 550/REV A/03-03
12
