
Technical Manual
1-2 Welch-Allyn, Inc.
Batteries The Model 678 and Model 679 thermometers use three standard
alkaline “AA” cells. These batteries are readily available and
provide long life for reduced down time. No battery charging is
required.
Note:
The use of Ni-Cad rechargeable batteries
is
allowed. The
nominal cell voltage of 1.2 volts for Ni-Cad (vs. 1.5 volts for
alkaline) combined with the lower actual capacity than
alkaline will result in a much shorter time between battery
charges than alkaline battery life.
Instrument The main instrument operates very similarly to the Model 675.
Basic operation has been kept similar to that of the Model 675 to
ease learning and use.
Wall Mount The wall holder is easily secured to a wall (or rolling stand). An
optional locking mechanism with a removable key for securing the
instrument is available. Through the use of available long probe
cords, the thermometer can be used without removing it from the
wall holder.
Probe The probe is similar to earlier probes. Model 670/675 probes
are incompatible with Model 678/Model 679 instruments, but
Model 767 and Welch Allyn Vital Signs Monitor probes can be
used in Model 678/Model 679 thermometers.
Probe Covers The probe covers are unchanged from previous models and are
compatible across all Welch Allyn and Diatek thermistor based
thermometers.
Welch Allyn’s thermistor-based probes can be identified by color
combinations as indicated in the following table.
Handle
Color
Top
Color
Cord
Color
Connector
Color
Model # Probe
Type
Green Green Green or Black Green M600 Oral
Red Red Green or Black Green M600 Rectal
Green Green Green Modular Phone style M650 Oral
Red Red Green Modular Phone style M650 Rectal
White Blue White Blue M670/M675 Oral
White Red White Red M670/M675 Rectal
White Blue White White with latch M678/679/767 Oral
White Red White White with latch M678/679/767 Rectal
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