6.3 Pulse and Vibration modules
Single and dual channel modules are available to transfer vibration probe signals from
a hazardous area to a safe one. Similarly, pulses from a switch,
proximity detector, current
pulse transmitter or voltage pulse transmitter, located in the hazardous area,
can be safely
transferred to the safe area.
6.3.1 MTL4531 - Vibration Transducer Interface
Single channel
The MTL4531 repeats a signal from a vibration sensor in a hazardous area, providing an
output for a monitoring system in the safe area. The interface is compatible with 3-wire,
eddy-current probes and accelerometers or 2-wire current sensors, and selection of the
mode is made with a switch located on the side of the module.
OFF position
ON position
2-/3-wire
2-/3-wire transducer setting switch
Mode SW
2-wire (3.3mA)* OFF
3-wire (20mA) ON
* Note: When using 2-wire
sensors, ensure that
terminals 1 and 2 are linked
as shown in the wiring
diagram above.
Terminal Function
1 Transducer power V–
2 Signal
3 Common
7 Signal output 0V
8 Signal output –ve
13 Supply –ve
14 Supply +ve
Hazardous area Safe area
6
5
4
3
2
1
Vibration
transducer
Vibration
transducer
Vs+
20 to 35V dc
9
8
7
12
11
10
13
14
Monitor
COM
SIG
V–
–ve
0V
3-
wire
2-
wire
2
1
3
Figure 6.21:
Top label for
MTL4531
WARNING! - Revision status 05 and below*
To enable optimum heat dissipation the recommended orientation for mounting is with
the module vertical, i.e. with the vents in the case at the top and bottom.
This enables air to flow through the module.
In any other orientation, i.e. with the module horizontal, then the maximum ambient
temperature is limited to:
• Close packed = 45°C
• Minimum of one module spacing = 55°C
*Revision status is the 2 digits after the +++ in the barcode
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