Detcon 700 HRT Bridge - Manual (Page 6)

HRT Bridge
700 Sensor HRT Bridge IM Rev.0.2 Page 2 of 18
2.0 Installation
The HRT Bridge PCA replaces the Transient Protection Assembly in the condulet the Model 700 sensor is
attached to. The condulet and the Model 700 sensor should be mounted as prescribed in the sensor’s manual.
For units that have been ordered with the HRT Bridge installed, the section on installing the HRT Bridge PCA
can be skipped.
2.1 Installation of HRT Bridge PCA
The HRT Bridge PCA replaces the Transient Protection Assembly (TPA) in the condulet attached to the
Model 700 sensor. The sensor is wired to the HRT Bridge PCA the same way as it is on the TPA so no re-
wiring of the sensor connector is necessary.
HRT BRIDGE
SENSOR
+24V
mA/HART
mA/HART
GND
+24V
CFG
HART
HART
440-005132-000
REV2
Figure 2 HRT Bridge PCA
1. Remove the power/mA output connector from the TPA if power is applied.
2. Remove the connector from the Transient Protection PCA that connects to the 700 sensor.
3. Remove the hardware holding the Transient Protection PCA and remove the TPA from the condulet.
4. Install the HRT Bridge PCA in the condulet, using the same hardware used with the TPA.
5. Plug the sensor’s connector into J3 on the HRT Bridge PCA, labeled “SENSOR”.
6. Wire the power and 4-20mA output as described below.
2.2 Connecting the HRT Bridge
The HRT Bridge connection to the Host is a simple 3 wire connection of Power, Power Return, and mA.
Refer to Error! Reference source not found.. Connect the 24VDC to the connector at J4 pin-3 labeled 24V.
Connect the 24V Return to the connector at J4 pin 2 Labeled GND, and connect the 4-20mA to the connector
at J4 pin 1 labeled mA/HART. The 4-20mA signal from the HRT Bridge must be connected to a load resistor
to operate properly. If this signal is not terminated properly, the HRT Bridge, and the HART Interface will fail
to work properly.
If not already plugged in, plug the connector from the Model 700 sensor into the header J3, labeled
“SENSOR” on the HRT Bridge PCA.
The HART CFG Connector (J8) provides a connection for handheld devices such as the Emerson 375 Field
Communicator without having to remove power from the unit. The two pins of the HART CFG connector are
polarity independent and the two leads from the handheld configurator may be connected in any order.