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Documenting Process Calibrator
Source Mode
59
Source Temperature with a Hart Scientific Drywell
The Product can source temperature using a Hart Scientific
Drywell. Many models are supported.
The drywell driver is able to talk to other drywells from Hart
Scientific, provided that they respond to Hart Scientific’s
standard serial interface commands.
Connect the Product to the drywell by plugging the drywell
interface cable into the pressure module connector as
shown in Figure 24. If the drywell has a DB9 connector, plug
the drywell interface cable directly into the drywell using the
DB9 Null Modem adapter. Drywells with the 3.5 mm jack
connector need to use the serial cable supplied with the
drywell in addition to the Product drywell interface cable.
Join the DB9 connectors of the two cables, and connect the
3.5 mm jack to the drywell.
Be sure the drywell is configured for serial communication at
2400, 4800, or 9600 bits per second. Other rates are not
supported by the Product.
To source a temperature with a drywell:
1. If necessary, push for SOURCE mode.
2. Push t to display the temperature mode menu.
3. Select Drywell from the list of options, and press .
4. The Product will begin to search for a drywell. If the
Product shows Attempting connection for more than
10 seconds, double check your cable connections and
drywell configuration.
5. If a dual well is recognized, a menu will pop up that
allows you to select a "hot" or "cold" side of the dual
well. Only one side of the drywell may be controlled at a
time. Switching sides requires the drywell to be
reconnected, by disconnecting the serial cable or by
leaving drywell source mode and selecting it again.
6. When the drywell is connected, the primary display will
show the actual temperature of the drywell, as
measured by the drywell internally. The drywell model
number will appear above the primary reading. The
setpoint for the drywell is displayed in the secondary
display, at the bottom of the screen. Initially, the
setpoint will be set to the value already stored in the
drywell.
7. Enter the temperature you wish to source and press
.
The settled indicator will be cleared when the actual
temperature is within one degree of the setpoint, and the
actual temperature is not changing quickly. Refer to the
drywell documentation for that model's recommendations for
stabilization time.
The upper temperature limit is restricted by the "High Limit"
setting stored in the drywell. If the Product will not set the
drywell to temperatures within the drywell spec, refer to the
drywell manual to check the "High Limit" setting.
71


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