115
New Brunswick Scientific
User’s Guide
Problem
Possible Solution
AGITATION:
Agitator does not turn, or turns
only slowly.
•
The motor drive coupling may not be installed
properly; read the motor adaptation instructions in this
manual, then check the coupling.
•
Remove/replace the O-ring.
•
Make sure the motor is plugged into the cabinet
receptacle; TURN OFF MAIN POWER BEFORE
CONNECTING THE PLUG.
DO and pH PROBES:
DO probe readings are erratic.
•
Recalibrate the probe, carefully following instructions
in this manual.
•
Recharge the probe, carefully following instructions in
this manual.
•
Probe may need a new membrane and a refill of
electrolyte.
•
Check for a secure connection.
•
Replace probe cable or DO probe.
pH probe readings are erratic.
•
Recalibrate the probe, carefully following instructions
in this manual.
•
Check for a secure connection.
•
Gel-filled probe may need replacement.
•
Liquid-filled probe may need a refill of electrolyte.
•
Probe cable may need replacement.
Probe does not hold calibration.
•
Probe may be defective; replace it.
•
pH/DO board may be defective; call for service.
GASFLOW:
There is insufficient gas flow.
•
Inlet or exhaust sterile air filter may be wet or clogged;
replace it.
•
Check that the air pressure is within the specified
range.
•
Make sure the control mode for DO and for pH is set
to
AUTO
(not
OFF
).
•
Make sure that the GasFlo loop is ON.
•
Make sure that the Air loop is in O2 Enrichment mode.
•
Make sure that the DO cascades are Enabled.
GENERAL:
Touchscreen is not responding.
•
Calibrate
touchscreen.
