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1. Takethecapothehumiditycalibrationbottleandaddonehalfcapfullofsteriledistilledwatertothe

bottle. Shake the bottle to thoroughly mix the salt and water solution. Place the elbow on the bottle. The

smaller end goes over the bottle.

2. Slide the elbow over the humidity sensor (mounted on the back wall) until it stops.

3. Hold the override key while powering up to enter the service screen.

4. On the second service screen, select Cal RH. The screen will prompt “Push knob when RH reading is stable.”

Wait for 20 minutes or until the RH display stabilizes (does not change by more than 1% in 5 minutes).

5. You have the option to select STABLE, SET TO DEFAULT or EXIT. STABLE initiates calibration. SET TO DEFAULT

resets calibration values back to factory default settings. If you started calibration by mistake (without the

calibration bottle in place, for example) you would select SET TO DEFAULT and then calibrate the unit. If you

have entered the calibration routine by mistake, select EXIT to leave without initiating calibration

6. If “RH Sensor Calibration Completed” is displayed, the calibration is complete. Depress the knob to exit the

Cal RH routine.

7. If “RH Sensor Calibration Failed Try Again” is displayed, verify your setup and press the knob to try the

calibration again.

3.6 Servo Controlled Oxygen Calibration

1. Select Set Up icon (wrench) to bring up Set Up screen.

2. Scroll down and select Cal Oxygen to initiate calibration. Calibration is automatic and takes less than

veminutes.Abargraphindicatesprogresstowardcompletingcalibration.Ifforanyreasonyouwishto

discontinue calibration before it is completed, turning the control knob in either direction will cause the

word Cancel to appear on the calibration screen. Pushing in the control knob will discontinue calibration.

When calibration is completed, 100% oxygen is delivered for approximately 20 seconds to ensure there are no

occlusionsinthesystem.Donotturnotheunitordisconnecttheoxygensupplyduringthisbriefperiodafter

the ‘Calibration Complete’ screen appears.

NOTE: The servo control oxygen system prompts for calibration every 24 hours, but the system may prompt for

calibration if there is a large leak in the system (for example if a door is open) for half an hour.

CAUTION:

The servo-control system must be calibrated at the same atmospheric pressure in which it is to be

used. Operation at atmospheric pressures other than that present during calibration may result in

readings outside the stated accuracy for the unit.

Chapter 3: Calibration and Maintenance

GE Giraffe Service Manual

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