MTL4042 REPEATER POWER SUPPLY IIB 4/20mA, for 2-wire transmitters

4/20mA, for 2-wire transmitters
-
Hazardous area
MTL4042 REPEATER
POWER SUPPLY IIB
+
4/20mA
1
The MTL4042 provides a fully-floating dc supply for energising a
conventional 2- wire 4/20mA transmitter located in a hazardous
area, and repeats the current in another circuit to drive a safe-area load.
2
3
4
5
6
I
SPECIFICATION
See also common specification, cable parameters and
approvals
EUROPE (EMEA)
Tel: +44 (0)1582 723633
Fax: +44 (0)1582 422283
AMERICAS
Tel: +1 603 926 0090
Fax: +1 603 926 1899
ASIA PACIFIC
Tel: +65 6 487 7887
Fax: +65 6 487 7997
E-mail: enquiry@mtl-inst.com
Web site: www.mtl-inst.com
7
8
9 1 0 11 1 2 1 3 1 4
+ 4/20 –
mA
Safe area
Number of channels
One
Location of transmitter
Zone 0, IIB, T4–6 hazardous area if suitably certified
Div. 1, Group C, hazardous location
Voltage available for transmitter and lines
18.0V minimum at 20mA
Note: maximum open-circuit voltage is 28V
Input and output signal range
4 to 20mA
Over-/under-range
1.0mA to 21.5mA
Safe-area circuit load resistance
Conventional transmitters: 0 to 650Ω
Safe-area circuit output resistance
>1MΩ
Safe-area circuit ripple
<50µA peak-to-peak up to 80kHz
Transfer accuracy at 20°C
Better than 20µA
Temperature drift
<1µA/°C
Response time
Settles within 200µA of final value within 20ms
LED indicator
Green: one provided for power indication
Power requirement, Vs
65mA at 24V dc
75mA at 20V dc
50mA at 35V dc
Power dissipation within unit
1.2W at 24V with 20mA signal
1.4W at 35V
Isolation
250V ac between safe- and hazardous-area circuits
Safety description
Terminals 2 to 5
28V, 150Ω, 187mA, Um = 250V rms or dc
FM entity parameters
Voc = 28V dc, Isc = 185.5mA, Ca = 0.39µF, La = 4.5mH
I
Vs+
20–35V dc
Vs-
Load
Terminal
2
3
4
5
7
8
9
11
13
14
Function
Tx supply +ve
Optional connection
Optional connection
Current input –ve
Optional connection
Optional connection
Output +ve
Output –ve
Supply –ve
Supply +ve
+ve
–ve
+ve
–ve
June 2004
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