Section 2 - Calibrate; Calibrate Mode; Calibrating The Control Probe; Calibrating The Optional Sample Probe - VWR 5600 Series Operating And Maintenance Manual

VWR Signature Products_____________________________________________________________________Calibration

Section 2 - Calibrate

2.1 Calibrate Mode

Once the freezer has stabilized, the control or sample probe
may need to be calibrated. Calibration frequency is dependent
on use, ambient conditions and accuracy required. A good labo-
ratory practice would require at least an annual calibration
check. On new installations, all parameters should be checked
after the stabilization period.
Before making any calibration or adjustments to
the unit, it is imperative that all reference instru-
ments be properly calibrated.
a. Calibrating the Control Probe
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 the temperature of the measur-
ing device. See Chart 2-1 at the end of this section for more
detail.
1. Press the Mode key until the Calibrate indicator lights.
2. Press the right arrow until "CONT T = -XX.X" appears
in the message center.
3. Press up/down arrow to match the display to calibrated
instrument.
4. Press Enter to store calibration.
5. Press the Mode key to return to Run or the right/left
arrow to go to next/previous parameter.
b. Calibrating the Optional Sample Probe
For freezers with the optional sample probe, place the cali-
brated instrument in the center of the sample bottle. The bottle
should contain an appropriate medium and the measuring
instrument should be centered in the bottle.
1. Press the Mode key until the Calibrate indicator lights.
2. Press the right arrow until "SAMP T = -XX.X" appears
in the message center.
3. Press up/down arrow to match display to calibrated
instrument.
4. Press Enter to store calibration.
5. Press the Mode key to return to Run or the right/left
arrow to go to next/previous parameter.
See Chart 2-1 for calibration process functions.
Temperature Stabilization Periods
Startup - Allow 12 hours for the temperature in the cabinet to
stabilize before proceeding.
Already Operating - Allow at least 2 hours after the display
reaches set point for temperature to stabilize before proceeding.
During calibration, the temperature display will not be avail-
able.
If no keys are pressed for approximately five minutes while
in calibration mode, the system will reset to Run mode.
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