Welch Allyn SureTemp 670 - BASIC SYSTEM DESCRIPTION

Technical Manual
SureTemp
®
Model 670/SureTemp 4
®
Model 675 3
The basic end user operation of the Model 670 and Model 675 is covered in the User’s Manual and this
manual assumes an understanding of these operations. The following sections will help you determine if the
Model 670/675 is functioning properly and, if it is not, refer you to the proper section to isolate the problem.
There are many things that can be done to check operation before the unit is disassembled. This section
will cover these normal operating characteristics.
BASIC SYSTEM DESCRIPTION
The thermometer system consists of five main components. The batteries, the thermometer instrument, the
wall mount, the probe and the probe cover.
The Model 670 and Model 675 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 charging cycles than alkaline battery life.
The main instrument looks and operates very similarly to the Model 600 with enhancements described
below. Basic operation has been kept very similar to that of the Model 600 to ease learning and use.
The wall mount is easily mounted to a wall (or rolling stand) and provides a locking mechanism with a
removable key for securing the instrument. Through the use of available long probe cords, the thermometer
can be used without removing it from the wall mount.
The probe is similar in appearance to the Model 600 probe, but is incompatible with Model 600. Model 600
probes are also incompatible with Model 670/Model 675 instruments. Enhancements to the probe are
detailed in the Theory of Operation section.
Model 670 probes are incompatible with Model 675 probes, but Model 675 probes can be used in Model 670
thermometers.
The Model 675 instrument has a key in the connector receptacle to disallow any but Model 675 probes.
The probe covers are unchanged from previous models and are compatible across all of Welch Allyn and
Diatek thermistor based thermometers. Welch Allyn’s thermistor based probes can be identified by color
combinations as follows:
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
Blue Blue White Blue M670 Oral
Red Red White Red M670 Rectal
White Blue White White M675 Oral
White Red White White M675 Rectal