Appendix A | HART Interface
Introduction
IMPORTANT: This portion of the instruction manual is only applicable if
your unit has been shipped HART Enabled.
The fixed-point gas monitor is designed to provide continuous
monitoring of hazardous gases in the workplace. The is capable of
displaying one or two gas concentrations as well as sensor or instrument
specific diagnostics.
The HART supported comes
with a channel-1 4-20mA output
equipped with standard FSK HART
interface capability. The channel-1
HART output can be used to access
the process variables on digital
control systems or a HART
handheld device can be used to
access process variables of
from anywhere in the 4-20mA loop
as long as the handheld device is on
the modem side of the 250 ohm
load. parameterization can
also be accomplished through HART
interface.
Figure A - 1 HART Board
channel-2 has a standard 4-20mA output. is available with
an optional relay board, allowing the device to directly control external
devices such as fans, pumps, alarm horns, or warning lights. Also there are
three onboard relays available; two of the relays can be programmed for
alarm activation, while the third relay is a fault protection relay.
The is powered with a 24 VDC (12-28 VDC) power supply and
provides a 4-20mA control signal for each sensor.
For more details on specifications, supported sensor types, agency
approvals and EU, please see Chapter 1 |.
IMPORTANT: In Chapter 1 |, under “Specifications” section the “Signal
Outputs” specification is replaced with Table A - 1.
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