Shellab SWBR27-2 - Manual (Page 16)

16 Reciprocating Water Bath
Problem Possible Cause Solution
N/A
Check calibration. Using independent
thermometer, follow instructions in Calibrating the
Main Temperature Control.
N/A Put the cover on.
Unit will not heat up at all
N/A
Check amperage. Amperage should be virtually at
maximum rated (data plate) amperage.
N/A
Do all controller functions work? Amperage should
be virtually at maximum rated (data plate)
amperage.
N/A Set the Over Temperature Safety higher.
N/A Has the fuse or circuit breaker blown?
Indicated bath temperature
unstable
Fluctuating by ± 0.1?
May be normal, especially without the use of bath
cover.
Ambient room temperature is
radically changing
Temperature fluctuation due to door opening or
room airflow from heaters or air conditioning.
Stabilize ambient conditions.
Calibration sensitivity
Recalibrate. See Calibrating the Main
Temperature Control. Call customer service if
recalibration does not resolve fluctuation.
Bath not full Assure that the bath is at least 1/3 full.
Over Temperature Safety set too
low
Be sure that Safety set point is more than 5
degrees over desired Main set point; check if
Safety light is on continuously; turn controller
knob completely clockwise to see if problem
solved then follow instructions in Setting the Over
Temperature Safety Thermostat for correct
setting.
Electrical noise
Remove nearby sources of RFI including motors,
arcing relays or radio transmitters
Bad connection on temperature
sensor or faulty sensor Call customer service.
Will not maintain set point
N/A
Assure that set point is at least 5 degrees over
ambient room temperature.
N/A See if ambient is fluctuating.
Display and Reference
thermometer do not match
N/A See Calibrating the Main Temperature Control.
Temperature sensor failure Call customer service.
Controller failure Call customer service.
N/A Allow at least two hours to stabilize.
N/A Verify the reference thermometer is calibrated.
Cannot adjust set points or
calibration N/A Turn entire unit off and on to reset.
N/A If repeatedly happens, call Customer Service.
Calibrated at one temperature,
but not at another
N/A
This can be a normal condition when operating
temperature varies widely. For maximum
accuracy, calibration should be done as close to
the set point temperature as possible.
Note: N/A is not applicable.