Calibrate; Calibrate Control Probe - Thermo Scientific 902 Operating And Maintenance Manual

Calibrate

Section 2
Once the freezer has stabilized, the control probe may need to be
calibrated. Calibration frequency is dependent on use, ambient conditions
and accuracy required. A good laboratory practice would require at least an
annual calibration check. On new installations, all parameters should be
checked after the stabilization period.
Caution Before making any calibration or adjustments to the unit, it is
s
imperative that all reference instruments be properly calibrated.
Calibrate Control
Plug a type T thermocouple reader into the receptacle located inside the
lower door (see Figure 1-5). Compare the control temperature set point to
Probe
the temperature of the measuring device.
1. Press the Mode key until the Calibrate indicator lights.
2. Press up/down arrow to match the display to calibrated instrument.
3. Press Enter to store calibration.
4. Press the Mode key to return to Run mode.
Temperature Stabilization
Startup - Allow 12 hours for the temperature in the cabinet to stabilize
before proceeding.
Periods
Already Operating - Allow at least 2 hours after the display reaches set
point for temperature to stabilize before proceeding.
s
During calibration, the temperature display will not be available.
If no keys are pressed for approximately five minutes while in calibration
mode, the system will reset to Run mode.
Thermo Scientific Model 900 and 5900 Series 2-1