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Reference Manual
00809-0200-4702, Rev CA
Section 5: Operation and Maintenance: Models 702DX22 and 702DX61
February 2013
Operation and Maintenance: Models 702DX22 and 702DX61
Figure 5-9. Leak Sensor Not Connected - AMS Device Manager Overview screen
Table 5-1. Liquid Hydrocarbon Detection Interface, for Modbus mapping
Tab le 5 -1 describes use of the 702 transmitter for hydrocarbon detection in other
communications protocols such as Modbus or OPC. It is imperative that both PV and SV be
mapped to the host system so as to make a good interpretation of the condition and status of
the leak detector.
Important Notice
It is imperative that both PV and SV be mapped to the host system so that the diagnostic
information on the sensor status is captured.
In addition, system considerations must be observed to ensure that the device is still connected
to the wireless network and reporting values. On an Emerson Smart Wireless Gateway, this can
be done by referring to the parameter: PV_HEALTHY. PV_HEALTHY has a “True” state when the
device is on the network and its updates are current, not late or stale, and the device is
functioning properly. A “False” state of PV_HEALTHY means that the device is either off of the
network, the data updates are not current, or that there is a malfunction of the device (such as
an electronics failure). In the case of a “False” state of PV_HEALTHY, it is recommended to
assume that the device is not connected to the network and to take appropriate action.
PV SV Description / Interpretation
1.0 1.0 Normal condition, no leak detected, sensor status good
0.0 1.0 or
0.0
Leak detected, sensor status good
1.0 0.0 Sensor Not Connected, Assume Leak, take appropriate action
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