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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 lineari
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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 coldjunction compensation, the HAZ-CJC plug can be ordered with the
product, and includes an integral CJC sensor.
 


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.
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 (100Ω 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 400Ω (Input impedance 10MΩ)
Input signal span
3 to 150mV, or 10 to 400Ω
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: ±80mΩ
Output: ±11µA
Temperature drift (typical)
Inputs:
mV/THC: ±0.003% of input value/°C
RTD: ±7mΩ/°C
Output: ±0.6µA/°C
Example of calibration accuracy and temperature drift
(RTD input)
Span: 250Ω
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
600Ω
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

1.安全栅应安装在安全场所,并且环境条件满足《安全栅选型样本》中的“使用条件”的要求。

2. 隔离式安全栅本安端(蓝色端)和非本安端电路的连接导线在汇线槽中应分开铺设,各自采用独立的保护套管。本安侧的配线管道内不允许有其它电源线,包括其本安电路使用的电源线。

3.通往危险场所的导线应选用有蓝色标记的本安导线,导线的软铜面积必须大于0.5mm2,绝缘强度应大于500V。

4. 在对隔离式安全栅进行通电调试前,必须注意隔离式安全栅的型号、接线方法、线路极性等是否符合设计及产品要求中的规定,否则可能对人身及设备造成伤害。

5.严禁用兆欧表测试隔离式安全栅端子之间的绝缘强度。如要检查系统的绝缘强度,应先断开全部隔离式安全栅的接线,否则可能引起安全栅内部电路损坏。

6. 在现场对安全栅进行编程前,必须先将所有接线断开再接入编程器,然后通电编程,否则可能引起不良后果。

7.与隔离式安全栅相连接的现场仪表,均应采用通过经国家认定的有关防爆检验部门进行防爆试验、并取得防爆合格证的仪表。

8. 在设计、安装、使用、维护隔离式安全栅时,应同时遵守本产品使用手册中的说明及《GB3836.15-2000爆炸性气体环境用电气设备第15部分:危险场所电气安装(煤矿除外)》及

《GB50058-1992爆炸和火灾危险环境电力设置设计规范 》。
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
I
out = 7mA
P
out = 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
P
out = 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.

 

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