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The user can choose from normally open (NO) or normally closed (NC) contacts to suit
the application. Inductive loads should be provided with suitable suppression circuitry to
avoid damaging voltage spikes.
Consult the product datasheet for applicable drive voltages and relay contact ratings.
6.4
The MTL4-ADIO provides a fully floating dc supply for conventional 2 or 3-wire 4/20mA
transmitters. In addition, HART transmitters are supported, offering bi-directional
communications signals superimposed on the 4/20mA loop current. A link (LK1) can be
fitted to the module base to increase the transmitter voltage for non-HART applications,
when necessary. Consult the datasheet for full details.
Voltage
source
+
V
–
There is provision for a selection of sink or source current outputs on the system side, as
illustrated above, as well as a voltage option.
22
MTL4-BSGPR
MTL4-BSISR
Analogue input (AI)
MTL4-LNKIS-50
Fitting link LK1 will change the Safety Description of the product. Refer to
FIELD
Analogue
Input
Current
4 wire
2 wire
source
Tx
Tx
3 wire
Figure 6.4 - Analogue input options
Module base general-purpose relay
Module base IS relay
IS power jumper link (Pk50)
WARNING!
the certificate for details.
MTL4-SD
LK1
Loop
Disconnect
10V 14mA
1
A
Input/Output
2
B
Common
3
MTL4-ADIO
C
26.5V 90/136mA
4
MTL4-BSxx
SYSTEM
Analogue
Output
Current
Current
source
sink
Voltage
Input +
Tx+
Input +
V out
Input/
Load
Output
V
Input –
Input +
Input –
Common
Load
0V
INM MTL SUM5 Rev 1
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