Calibration Testing - Welch Allyn SureTemp Plus 692 Series Service Manual

3.6

Calibration Testing

Whenever the clinical accuracy of the thermometer is in question, verify the instrument
calibration. Your hospital biomedical department should establish a routine schedule for
verifying instrument calibration. It is recommended the unit be tested annually.
3.6.1 Cal-Key Verification
This method uses a fixed value to verify that the device is calibrated properly.
1. Remove any probe currently connected to the SureTemp
2. Connect the SureTemp
3. Wait one minute for the device to enter Monitor mode and display the temperature.
4. The temperature should read 36.3 +/- 0.1ºC or 97.3 +/- 0.2ºF.
5. Remove the SureTemp
6. Connect the original probe back to the device.
3.6.2 Model 9600 Plus Calibration Tester Verification
This method is used to verify the calibration of the unit and probe at three set point
temperatures 36.0ºC (96.8ºF), 38.5ºC (101.3ºF), 41.0ºC (105.8ºF). Use a verified
thermometer from the Cal-Key Verification (3.5.1) and a functioning probe.
CAUTION: Store thermometers for testing in the same room as the 9600 Plus Calibration
Tester for approximately 30 minutes prior to testing to allow for thermal accommodation.
1. Plug in the Model 9600 Plus Calibration Tester wall transformer to electrical power.
2. The 36.0ºC (96.8ºF) temperature setting is selected when the calibration tester is first
powered on.
If the calibration tester is all ready powered on, change the temperature setting on the
Model 9600 Plus Calibration Tester to 36.0ºC (96.8ºF) with the up/down arrow key
(temperature will scroll through the 3 settings).
It is important to use the lower temperature setting first because the stabilization time from
high temperature to low temperature takes about twenty (20) minutes. Stabilization time
from a lower temperature to a higher temperature takes about six (6) minutes.
3. Wait for the displayed temperature to stop blinking. The actual temperature displayed
blinks until the set temperature has stabilized.
4. Remove the probe from the thermometer well and clean it with either a 70% isopropyl
alcohol solution, a 10% chlorine bleach solution, or a non-staining disinfectant. Let the
probe air dry for at least five minutes. Do not apply a probe cover. Place the thermometer
in Monitor Mode. Refer to the thermometer's Operator's Manual.
5. Rotate the dust cover down so the Thermistor Device Port is open/available, leaving the
Ear Device Port covered, and insert the probe fully into the small hole on top of the Model
9600 Plus Calibration Tester.
SureTemp® Plus Service Manual
®
Plus Cal-Key (PN 06138-000).
®
Plus Cal-Key.
®
Plus Thermometer.
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