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262 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Installing Relays
To comply with hazardous area requirements:
• Model 3100 relay modules must be mounted into a suitable and classified enclosure that
provides ingress protection of at least IP4X according to EN 60529, taking into account the
environmental conditions into which the equipment will be installed.
• The external metal parts of the relay module (heat sinks) must be connected to the
potential-equalizing system within the hazardous area.
UL and CSA
Model 3100 relay modules are suitable for installation in Class I, Division 2, Groups A, B, C, and D.
Note: For CSA compliance, the relay module must be installed in a suitable enclosure where the final
combination is subject to acceptance by the Canadian Standards Association (CSA).
D.3.2 User-supplied relays
User-supplied relays to be used for Zone 2 applications must be certified as Category 3 equipment.
D.4 Replacing relays
You may not replace a defective relay separately. If an individual relay is defective, you must replace
the entire relay module.
This requirement applies to both the Model 3100 and to user-supplied relays, and to both hazardous
and non-hazardous areas.
D.5 Using relays with the Series 3000 device
A relay is used to connect the Series 3000 device’s discrete outputs to control devices.
D.5.1 Series 3000 discrete outputs
The Series 3000 has three discrete outputs, which can be configured for specific application
requirements. The outputs have the following characteristics:
• Polarity:
- Active high or active low
- Software selectable
•Current:
- Sourcing at 5.6 mA, V
out
= 3 VDC minimum
- Sinking up to 500 mA at 30 VDC supply maximum
Figure D-1 shows a diagram of a typical discrete output circuit.