Flowmetering

Flowmetering ancillaries

Technical data (at 20°C)

Power supply

Power consumption

Isolation (tested to)

Relay supply

Environmental

Universal input types

Sensor and

Sensor range

and linearisation

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)

10 VA (worst case)

500 V

Supply to I/O 3 750 V

BS EN 61010-1 for connection to an installation over-voltage Category II supply (Pollution degree 2)

IP rating

Ambient operating temperature

Ambient storage

Ambient humidity

EMC: Emissions and immunity

Safety

Sensor

mA

RTD

T/C

mV

Volts

Minimum span

Basic accuracy

Thermal drift

Input impedance

Linearity

IP65 (front panel only)

-30 to +60°C (-22°F to +140°F)

-50 to +85°C (-58°F to +185°F)

10 to 90% RH

BS EN 61326

BS EN 61010-1

Sensor range and linearisation

4-20 mA, ± 20 mA, ± 10 mA

Pt 100, NI 120, custom

K, J, T, R, S, B, N, L, B, E, Custom*

± 100 mV

± 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.

0.05% FS ± 0.05% of reading

200 ppm/°C

20Ω

Linear, X

1/2

, X

3/2

, X

5/2

, custom*

Current input

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

Physical layer

Protocol

Isolation

Maximum fan out

Termination standard

Option pods

The M750 has Modbus RTU protocol with RS485 serial communications as standard.

4 wire or 2 wire half duplex RS485

Modbus RTU format

500 Vac

32 units (this can be increased with repeaters)

RS485

The M750 has interchangeable output pods that are automatically recognised by the unit. The dual relay pod has two independent mains

rated relays that can be configured for high or low alarms or pulse output. The isolated re-transmission pod provides 0-10 mA, 0-20

mA or 4-20 mA active or passive outputs.

Dual relay alarm pod

Two independent mains rated relay outputs, which can operate as alarms or pulsed output

Contacts

Ratings

Maximum load

Maximum power

Maximum switching

Termination

2 x changeover relays with common

ac

dc

5 A@250 V

1 250 VA

253 volts

5 way tension clamp connector

5 A@30 V (inductive load 2 A)

150 W

125 volts

Isolated 4-20 mA re-transmission pod

Isolated analogue retransmission for use with chart recorders, Building Management Systems, etc.

Ranges

Minimum current output

Maximum current output

Accuracy

Maximum output load

Maximum external supply voltage

Isolation

Termination

0-10 mA (Active or Passive),

0 mA

23 mA

0.07% FS

Active 1 K Ω

Passive [(Vsupply - 2)/20] K Ω

0-20 mA (Active or Passive),

4-20 mA (Active or Passive)

30 V (Passive mode)

500 Vac

5-way tension clamp connector

M750 Display unit

TI-P332-08 MI Issue 2

3.5.10