Dräger REGARD 4208797, REGARD 4208839, REGARD 4208840 Installation, Operation And Maintenance Manual

Issue 1 – November 2006

REGARD 3900

4-20mA output module

Installation, operation and maintenance

2 Issue 1 – November 2006

FOR YOUR SAFETY

Follow the instructions

Read this manual before installing the module.

Maintenance

The equipment must be inspected and serviced regularly by trained personnel. Keep
a record of inspections and servicing.

Repairs of this equipment should only be carried out by competent personnel.

We recommend that either a training course or service contract is obtained from
Draeger and that all repairs are carried out by them.

If the system is being used to monitor flammable gases/vapours and/or oxygen, refer
to EN 50073 and/or local regulations.

Not for use in areas where explosion hazards are possible

This equipment is not approved or certified for installation in potentially explosive
atmospheres.

Liability for proper function or damage

Liability for proper function of the equipment is irrevocably transferred to the owner or
operator to the extent that the equipment is serviced or repaired by personnel not
employed or authorised by Draeger, or if the equipment is used in a manner not
conforming to its intended use.

Draeger Safety UK Limited can not be held responsible for any damage caused by
non-compliance with the above recommendations. The warranty and liability
provisions of the terms and conditions of sale and delivery of Draeger Safety UK
Limited are likewise not modified by the recommendations given above.

Issue 1 – November 2006 3

INTENDED USE

• For remote indication or recording of gas levels.

• Not for control of counter-measures against risk of explosion. The 4-20mA output

module is not included in the scope of the Regard 3900 ATEX EC-type
examination.

The module must be mounted within the Regard 3900 control unit enclosure. Up to
four modules can be installed if there is space in the enclosure.

• Do not mount the module outside the 3900 enclosure.

• Do not extend the 3900 ribbon cable or use a longer ribbon cable, in order to

install output modules remote from the input module(s).

The module can be used in Regard 3910 systems. Do not exceed 2m ribbon cable
length.

The Regard 3900 4-20mA output module will not work with Regard 3800.

DESCRIPTION

The module has eight outputs, electrically isolated from the Regard 3900 system.

Each output is a current source and will only work when connected to a passive load.

Each output has two terminals:
+ output
– module 0V

The module’s 0V is isolated from the Regard 3900 system 0V.

Each output supplies a 4..20mA signal proportional to the gas level for its
corresponding input channel. The module’s outputs correspond to channels 1-8 or
channels 9-16 of the Regard 3900 system, depending on the position of the
Channels link on the 4-20mA output module.

The output of inactive channels is 0mA.