7102
User’s Guide
24
Scan Rate
The next function in the main menu is the scan rate. Set the scan rate from .1 °C/min to 99.9 °C/min.
The maximum scan rate, however, is limited by the natural heating or cooling rate of the instrument.
This is often <100 °C/min, especially when cooling.
The scan rate function appears in the main menu after the scan control function. The scan rate units
are in degrees C per minute.
Sr= 10.0 Scan rate in °C/min
Push UP or DOWN to change the scan rate.
Sr= 2.0 New scan rate
Push SET to accept the new scan rate and continue.
Temperature Display Hold
The Product has a display hold function which allows an external switch to freeze the displayed
temperature and stop the scan of the set-point. Use this function to test thermal switches and cut-outs.
The instrument must be powered off before you attach thermal switches or cut-outs. This section
explains the functions available that operate the temperature hold feature. An example of how to set up
and use the hold feature to test a switch follows.
To enable the hold feature, push UP when the temperature displays. The hold temperature display
shows the hold temperature on the right and the switch status on the left. For the status c means the
switch is closed and o means the switch is open. In the active position of the switch, the status flashes
(opposite the normal position). The hold temperature shows what the temperature of the well was when
the switch changed from its normal position to its active position. While the switch is in the normal
position, the hold temperature will follow the well temperature.
If the Scan Control is OFF and the hold temperature display is in use, the temperature at which the
switch is activated does not affect the set-point temperature. However, if the scan control is ON and
the hold temperature display is in use, the temperature at which the switch is activated is stored as the
new set-point temperature.
Operation of the temperature hold display is outlined below.
143.50C Well temperature display
Push UP Access hold display
c 144.8 Switch status and hold temperature
Push DOWN to return to the normal well temperature display.
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