Flowmetering Flowmetering ancillaries 3
Technical data (at 20 °C)
90-264 Vac 50/60 Hz 90-253 Vac 50/60 Hz for compliance with LVD and UL BS EN 61010-1 for connection to an installation over-voltage Category II supply (Pollution degree 2)
Power supply
Power consumption
10 VA (worst case)
500 V Supply to I/O 3 750 V
Isolation (tested to)
BS EN 61010-1 for connection to an installation over-voltage Category II supply (Pollution degree 2)
Relay supply
IP rating
IP65 (front panel only)
Ambient operating temperature
-30 to +60 °C (-22 °F to +140 °F)
Ambient storage
-50 to +85 °C (-58 °F to +185 °F)
Environmental
Ambient humidity
10 to 90% RH
EMC: Emissions and immunity
BS EN 61326
3.5 12
Safety
BS EN 61010-1
Universal input types
Sensor
Sensor range and linearisation
mA
4-20 mA, ± 20 mA, ± 10 mA
RTD
Pt 100, NI 120, custom
T/C
K, J, T, R, S, B, N, L, B, E, Custom*
Sensor and Sensor range and linearisation
mV
± 100 mV
Volts
± 10 V, ± 5 V, 1 - 5 V, ± 1 V
Any span within the range can be selected, but the recommended span is > 10% of range.
Minimum span
Basic accuracy
0.05% FS ± 0.05% of reading
Thermal drift
200 ppm/ °C
Current input
Input impedance
20 Ω
Linearity
Linear, X1/2, X3/2, X5/2, custom*
A 19 V @ 25 mA isolated power supply is provided to power the current loop. * Custom can be up to 60 co-ordinate pairs or up to 7 segments of 15 th order polynomial.
Communications RS485 Modbus communications
The M750 has Modbus RTU protocol with RS485 serial communications as standard.
Physical layer
4 wire or 2 wire half duplex RS485
Protocol
Modbus RTU format
Isolation
500 Vac
Maximum fan out
32 units (this can be increased with repeaters)
Termination standard
RS485
TI-P332-08 EMM Issue 4
Page 2 of 4
M750 Display unit
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