NEW BRUNSWICK SCIENTIFIC CO28IR, Руководство по эксплуатации

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31
New Brunswick Scientific User’s Manual
Symptom Possible Cause(s) & Solution(s)
TEMPERATURE CONTROL (continued)
Indicated chamber temperature unstable
(continued) 8. Bad connection on temperature sensor or faulty
sensor: check connectors for continuity and
mechanical soundness while watching display
for erratic behavior; check sensor and wiring for
mechanical damage.
9. Bad connections: check connectors for
mechanical soundness and look for corrosion
around terminals or signs of arcing or other
visible deterioration.
10. Water jacket empty or low: check indicator
warning light or water level at fill port in back of
unit.
Will not maintain setpoint 1. Assure that setpoint is at least 5º over ambient.
2. See if ambient is fluctuating: check for adjacent
open doors or HVAC duct openings; stabilize
ambient conditions.
Display and reference thermometer don’t
match 1. Calibration error: see Sections 5.4 and 5.8.
2. Temperature sensor failure: evaluate whether
pilot light is operating correctly.
3. Controller failure: evaluate whether pilot light is
operating correctly.
4. For ovens: allow at least two hours to stabilize.
5. Verify that reference thermometer is certified.
Can't adjust setpoints or calibration 1. Turn entire unit off and on to reset.
2. If this happens repeatedly, call Customer
Service.
Calibrated at one temperature, but not at
another This can be a normal condition when operating
temperature varies widely. For maximum accuracy,
calibration should be done at or as close to the
setpoint temperature as possible.
CO
2
LEVEL CONTROL
Overshoots setpoint but stabilizes; display
and Fyrite match
1. Turn setpoint up and down to see if solenoid
works by feeling and listening to valve.
2. Recalibrate with Fyrite: see Sections 5.11 and
6.
3. Fan not operating correctly: (a) fan motor
stopped, (b) fan fell off. or (c) wrong fan blade
installed or blade is mounted backwards.
4. Wrong restrictor installed or missing altogether:
call Customer Service.
5. Wrong controller software/has fast recovery
software in error: give Customer Service the
part number on the controller chip to confirm.
6. Input pressure too high: should not exceed 20
psi.
7. CO
2
sensor partially plugged with dirt or
condensation.
...continued...