Welch Allyn, Inc.
8 SureTemp
®
Model 670/SureTemp 4
®
Model 675
button turns on the backlight only for the duration of the button press and then at the end of a Normal mode
temperature, the reading will display with the backlight for 5 seconds.
Note:
When a temperature is recalled, the mode in which it was obtained (Normal or Monitor) will be shown
independent of the present setting of the mode switch.
Note:
When the instrument is in Monitor mode the last temperature memory is updated every second.
During the time between removing the probe from the patient, (at say 99.0 degrees) to inserting the probe in
the storage channel, it will have cooled. Therefore, the temperature stored in memory will be lower than the
patient’s temperature. This is not an issue in Normal mode as the memory is not updated after the
temperature is displayed.
If the backlight does not work or is showing other problems or if you cannot recall the last temperature, refer
to the
Backlight/Temperature Recall Problems
section in the
Troubleshooting
section on page 22.
F/C Switch
The temperature scale displayed can be changed at any time by use of the slide switch on the top of the
unit.
Note:
A recalled temperature will be displayed in whichever scale is selected at the time of recall. This can
also be changed during display.
If the F/C switch does not change the scale of the displayed temperature, refer to the
F/C Switch Problems
section in the
Troubleshooting
section.
Biotech Mode
Biotech mode provides the ability to query the following information:
1. Battery voltage (total of all three).
2. Internal instrument calibration signal.
3. Instrument’s ability to detect probe type.
4. Software revision.
5. Display test.
Biotech mode is entered by the following steps:
1. Remove at least one battery.
2. Set the Normal/Monitor mode slide switch to Monitor.
3. While pressing and holding BOTH the Backlight/Recall and Timer switches, install the last battery.
4. Observe the display. The Monitor mode icon “M” will be flashing and the low battery icon will be on
steady. The timer will be operating. The number showing on the display is the total battery voltage. The
battery is considered acceptable if higher than 3.4 volts. New batteries should produce 4.5 volts or more.
Each thermometer is factory tested for accuracy down to a supply voltage of 2.9 volts. At about 3.2
volts, the low battery error E3.0 is triggered, the malfunction icon [X] is displayed, and temperature taking
is disallowed. This provides a margin of safety in preventing any inaccuracy in the results.
5. Press the Backlight/Recall button once to advance the display to the internal calibration signal. This
reading is generated by the instrument reading an internal precision fixed resistor as if it were a probe. If
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