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9103
User's Guide
To set up the test:
1. Connect the switch wires to the terminals on the front of the Product and place the switch in the
well.
2. Enable set-point scanning by setting the scan to ON in the primary menu (see
3. Set the scan rate to a low value, say 1.0°C/min. (see
can lose accuracy because of transient temperature gradients. If the scan rate is too low the
duration of the test may be longer than is necessary. Experiment to find the best scan rate.
4. Set the first program set-point to a value above the expected upper switch temperature, say 90°C.
5. Set the second program set-point to a value below the expected lower switch temperature, say
40°C, in the program menu.
6. Collect data on a computer connected to the RS-232 port. Refer to
for instructions on configuring the RS-232 communications interface.
Set-point Resistance
To display set-point resistance, push SET and DOWN simultaneously when the temperature appears.
When SET and DOWN are released, the temperature appears again.
Temperature Scale Units
To toggle between °C and °F, push SET and UP simultaneously when the temperature appears.
Secondary Menu
Functions which are used less often are accessed within the secondary menu. To access the
secondary menu, push SET and EXIT simultaneously and then release. The first function in the
secondary menu is the heater power display (see Figure 4).
Thermal Electric Devices (TED)
The temperature controller controls the temperature of the well by pulsing the TED on and off. The total
power being applied to the TED is determined by the duty cycle or the ratio of TED on time to the pulse
cycle time. By knowing the amount of heating, the user can tell if the calibrator is heating up to the set-
point, cooling down, or controlling at a constant temperature. Monitoring the percent heater power
allows the user to know the stability of the well temperature. With good control stability the percent
heating power should not fluctuate more than ±5 % within one minute.
The heater power display is accessed in the secondary menu. Push SET and EXIT simultaneously and
release. The heater power displays as a percentage of full power.
100.0
SET+EXIT
SEC
12.0P
To exit from the secondary menu, push EXIT. To continue on to the proportional band setting function,
push SET.
Well temperature
Access heater power in secondary menu
Flashes
Heater power in percent
Scan
Rate). If the scan rate is too high you
Digital Communication Interface
Scan
Control).
14
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