Description; Product Overview; Intended Use; Limitations On Use - Dräger Regard 3900 Instructions For Use Manual

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Description

2.1

Product overview

The Dräger Regard 3900 series is a range of controllers that are used to continuously monitor up to sixteen 4–20 mA remote
sensor transmitters in order to warn of potentially dangerous or harmful conditions.
The series includes the Regard 3900, 3910 and 3920. The Regard 3900 and 3920 are sealed control panels, and the Regard
3910 is a modular system intended to be installed in a rack-based system. Other differences are explained in this document
where necessary.
The controller monitors the current signals from the remote sensor transmitters on input channels and provides warnings when
alarm or fault conditions occur. Each of the input channels can provide alarms for up to three gas levels (A1, A2 and A3) and two
fault conditions (F1 and F2). The gas-level alarms are configured to provide an indication of potentially dangerous or harmful gas
levels at the transmitter, and can be set to activate as the monitored gas levels are rising or falling. The faults (F1 and F2) operate
when the transmitter sends the relevant fault signal (F2 is only used when the transmitter provides a second fault signal).
The combination of internal control modules (input modules, relay modules and output modules) and the controller configuration
settings can be altered to meet the gas detection and warning requirements. Additionally the warning devices used with the
controller can be selected and configured as required by the user. The Regard 3900 series controllers are configured using a
based software program. The Regard 3920 also has a built-in configuration system.
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Microsoft Windows
2.2

Intended use

Regard 3900 series controllers are used with 4–20 mA transmitters to provide stationary, continuous monitoring of flammable
or toxic gases and vapours, and oxygen deficiency or enrichment. The controller is primarily intended for use as a part of a gas
detection system, but can be used with any remote sensor transmitter which uses a 4–20 mA source output (transmitters that
use a 4–20 mA sink output cannot be used). This document describes the Regard 3900 series used as a controller for a gas
detection system.
The controller is intended for use in residential, commercial and industrial environments to provide:
● Display of measured gas level.
● Visual and audible alarms at the controller and external warning devices.
2.3

Limitations on use

WARNING
!
The controller is not designed or approved for use in areas where combustible or explosive gases, vapours or dust mixtures
are likely to occur. Do not use the Regard 3900 series controller in areas subject to explosion hazards ("hazardous
areas") without suitable protection. Contact Dräger for further information.
The controller cannot be used with three-wire transmitters that have a 4–20 mA sink output.
2.4

Approvals

The Regard 3900 series controller is certified according to the directive 94/9/EC (ATEX directive) to be operated with performance
approved 4–20 mA transmitters (EC-type examination certificate TRL 06 ATEX 21099X).
Output modules are not included in the scope of the Regard 3900 ATEX EC-type examination. Output modules shall not be used
for countermeasures against risk of explosion.
Special conditions for safe use according to EC-type examination certificate TRL 06 ATEX 21099 X
1. Only remote sensor transmitters with valid and appropriate ATEX certification for safety and measurement performance shall
be connected to this control equipment. These connections may be via ATEX certified safety interface barriers.
2. Any cable used for interconnection of remote sensor transmitters should be selected to ensure that its resistance does not
have any adverse effects on the operation of the control unit.
Requirements of EN 60079-29-1
If a Regard 3900 series controller is used for flammable gas detection to protect against risk of explosion, at least one gas alarm
relay should be set latching. (See EN 60079-29-1:2007 Explosive atmospheres – Gas detectors – Performance requirements of
detectors for flammable gases.)
CE Marking and ATEX approval
The Regard 3900 is CE marked to indicate conformity to the following directives:
● ATEX directive 94/9/EC
● EMC directive 2004/108/EC
● Low-voltage directive 2006/95/EC
Regard 3900 Series
Description
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