Dräger Polytron Pulsar 2 Open Path Gas Detector with HART
Dräger Polytron Pulsar 2 Open Path Gas Detector
with HART
The HART enhanced Dräger Polytron Pulsar 2 Open Path Gas Detector allows
basic digital communications between the receiver in the field and the safe area
without the need for extra cable cores. The digital signals are overlaid on the
0-20mA analogue current as a symmetrical modulation, ensuring that the integrity
of the normal reading remains unaffected. The Dräger Polytron Pulsar 2 Open
Path Gas Detector is fully compatible with Version 5 standards for a slave device
published by the Hart Communication Foundation (HCF). Thus Dräger Polytron
Pulsar 2 Open Path Gas Detector inputs to a multiplexer can be mixed with those
from any other HART-compatible device, including Dräger point detectors.
Figure 11: Typical Hart Installation
PC running Emerson
AMS Software
RS232 / RS485
Converter
RS485 multidrop
(max 31 x MTL4841)
1
32
Normal 0-20mA outputs
to control equipment
HART multiplexor
M 2 x MTL4842 (max)
0-20mA analogue
current loops with
HART digital signals
1
32
Pulsar Receivers or
other HART devices
1 to 32 (max 256)
Maintenance
Observe EN 60079-29-2 and respective national regulations.
WARNING
The Dräger Polytron Pulsar 2 Open Path Gas Detector contains
no user serviceable components. In the event of suspected
failure of the transmitter or receiver, the suspect unit should be
returned to Dräger UK Ltd.
NO ATTEMPT SHOULD BE MADE TO DIS-ASSEMBLE THE UNITS
IN THE HAZARDOUS AREA!
!
1.
The Dräger Polytron Pulsar 2 Open Path Gas Detector has been designed
so that it will give long and reliable service with the minimum of maintenance.
The Dräger Polytron Pulsar 2 Open Path Gas Detector will warn the operator
if the optics becomes contaminated or if it becomes misaligned for any
reason.
2.
Depending on the application and the environment as well as the work
practices at the site planned maintenance consists of-
•
Checking the detectors response to Gas Check Cards. Ensuring firstly that
any control functions have been inhibited.
•
Cleaning of the optics as necessary. If the detector warns of contaminated
optics or if it is known that the detector may have been contaminated by
drilling mud, oil mist, dust etc. The lenses are specially coated to assist in
keeping them clean, however if it becomes necessary to clean them care
must be taken so as not to remove the lens coating. A soft cloth with clean
fresh water or Dräger UK Ltd lens cleaning fluid should be used. The detector
should be realigned and re-zeroed as per the instructions following any work
on the detector.
