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: +65 487 7887
Fax: +65 487 7997
E-mail: enquiry@mtl-inst.com
Web site: www.mtl-inst.com
June 2004
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: +65 487 7887
Fax: +65 487 7997
E-mail: enquiry@mtl-inst.com
Web site: www.mtl-inst.com
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: +65 487 7887
Fax: +65 487 7997
E-mail: enquiry@mtl-inst.com
Web site: www.mtl-inst.com
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: +65 487 7887
Fax: +65 487 7997
E-mail: enquiry@mtl-inst.com
Web site: www.mtl-inst.com
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: +65 487 7887
Fax: +65 487 7997
E-mail: enquiry@mtl-inst.com
Web site: www.mtl-inst.com
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: +65 487 7887
Fax: +65 487 7997
E-mail: enquiry@mtl-inst.com
Web site: www.mtl-inst.com
SPECIFICATION
See also common specification
Number of channels
One
Signal source
Types J, K, T, E, R, S, B or N THCs to BS 4937
EMF input
2/3/4-wire platinum RTDs to BS 1904/DIN43760 (100ž at 0°C)
Location of signal source
Zone 0, IIC, T4 hazardous area
Div.1, Group A, hazardous location
Input signal range
–75 to +75mV, or 0 to 400
Ω (Input impedance 10MΩ)
Input signal span
3 to 150mV, or 10 to 400
Ω
RTD excitation current
200µA nominal
Cold junction compensation
Automatic or selectable
Cold junction compensation error
≤1.0°C
Common mode rejection
120dB for 240V at 50Hz or 60Hz
Series mode rejection
40dB for 50Hz or 60Hz
Calibration accuracy (at 20°C)
(includes hysteresis, non-linearity and repeatability)
Inputs:
mV/THC:
±15µV or ±0.05% of input value
(whichever is greater)
RTD:
±80m
Ω
Output:
±11µA
Temperature drift (typical)
Inputs:
mV/THC:
±0.003% of input value/°C
RTD:
±7m
Ω/°C
Output:
±0.6µA/°C
Example of calibration accuracy and temperature drift
(RTD input)
Span:
250
Ω
Accuracy:
± (0.08/250 + 11/16000) x 100%
=0.1% of span
Temperature drift: ± (0.007/250 x 16000 + 0.6) µA/°C
= ±1.0µA/°C
Safety drive on sensor burnout
Upscale, downscale, or off
Output range
4 to 20mA nominal (direct or reverse)
Maximum load resistance
600
Ω
LED indicator
Green: one provided for power and status indication
Power requirement, Vs with 20mA signal
68mA at 24V
82mA at 20V
52mA at 35V
Power dissipation within unit with 20mA signal
1.5W at 24V
1.6W at 35V
MTL5074 TEMPERATURE
CONVERTER
THC or RTD input
The MTL5074 converts a low-level dc signal from a temperature
sensor mounted in a hazardous area into a 4/20mA current for
driving a safe-area load. Software selectable features include
linearisation, ranging, monitoring, testing and tagging for eight
thermocouple types and 2-, 3- or 4-wire RTDs. For thermocouples
requiring cold-junction compensation, the HAZ-CJC plug can be
ordered with the product, and includes an integral CJC sensor.
Terminal
Function
1
THC/EMF/RTD input –ve
3
THC/EMF/RTD input +ve
4
3-wire RTD input –ve
5
4-wire RTD input +ve
11
Output –ve
12
Output +ve
13
Supply –ve
14
Supply +ve
Isolation
250V ac between safe- and hazardous-area circuits and power
supply
Safety description
Terminals 1 and 3
i) Without CJ plug
Vout = 1.1V
Iout = 7mA
Pout = 2mW
Non-energy-storing apparatus
≤1.2V, ≤0.1A, ≤20µJ and ≤25mW.
Can be connected without further certification into any IS loop
with open-circuit voltage not more than 10V.
ii) With CJ plug
Vout = 6.6V, Iout = 10mA
Pout = 17mW
Terminals 1 and 3, 4 and 5
Vout = 6.6V, Iout = 76mA
Pout = 0.13W
Configuration socket (CON6)
Vout = 8.3V, Iout = 15mA
Pout = 26mW
Standard configuration
Input type
RTD, 3-wire
Linearisation
enabled
CJ Compensation
disabled
Units
°C
Damping/Smoothing value
0 seconds/0 seconds
Output zero
0°C
Output span
250°C
Tag and description fields
blank
Open circuit alarm
set high (upscale)
Transmitter failure alarm
set low (downscale)
CJ failure alarm
set low (downscale)
Line frequency
50Hz
Configurator
A personal computer running MTL PCS45 software with a PCL45
interface.
TO ORDER, specify:
MTL5074
Includes HAZ-CJC signal plug (with internal CJC
sensor). For use with thermocouple, mV or RTD
inputs.
MTL5074-RTD
Includes standard HAZ1-3 signal plug. For use
with mV or RTD inputs. (Can be used with
thermocouples with cold-junction compensation if
HAZ-CJC plug is fitted.)
HAZ-CJC
Hazardous-area signal plug for terminals 1 to 3
including cold-junction compensation sensor.
Configuration socket
Hazardous area
Safe area
7
8
9
Vs–
Vs+
20 to 35V dc
+
–
mV
Load
4-wire
3-wire
–
+
4/20mA
mV
I
10
11
12
13
14
6
5
4
3
2
1
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