HAZ-CJC

MTL5074 TEMPERATURE CONVERTER THC or RTD input Hazardous area Safe area Configuration socket 4-wire 3-wire 6 5 4 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. mV +3 2 1 – mV I 7 8 9 10 – 11 4/20mA 12 + 13 14 Load Vs– 20 to 35V dc Vs+ Terminal 1 3 4 5 11 12 13 14 Function THC/EMF/RTD input –ve THC/EMF/RTD input +ve 3-wire RTD input –ve 4-wire RTD input +ve Output –ve Output +ve Supply –ve Supply +ve 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 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 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. 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.) Hazardous-area signal plug for terminals 1 to 3 including cold-junction compensation sensor. MTL5074-RTD HAZ-CJC EUROPE 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