Flowmetering Flowmetering ancillaries 3
Technical data for the M850 series flow computers
I type (0 / 4 - 20 mA current loop analog inputs)
Signal type
0 - 20 mA or 4 - 20 mA
2-wire passive transmitter (supplied from M850) or active transmitter (current source transmitter)
Transmitter connection
Input resistance
95 W ±10% (protected with PTC 50 mA fuse in series)
24 Vdc +10% / -20%; max 22 mA per channel (protected with PTC 50 mA fuse and 100 Ω resistor in series)
Transmitters supply
A / C converter resolution
18 bit (24 bit Sigma-Delta ADC)
50 Hz / 60 Hz filter
Sinc3 digital filter
Damping (1 st order Low Pass Software Filter time constant)
2 s / 5 s / 10 s / 20 s / 30 s / 1 min / 2 min / 3 min / 5 min
3.5 3
Measurement resolution
> 0.01% of FS
Accuracy (at T amb = +25 °C / +77 °F)
± 0.1% of FS (typical W 0.05% of FS)
Temperature drift
Maximum ± 0.02% of FS / °C
± 40 Vdc / SELV
Maximum input voltage
Galvanic isolation between inputs
No; common potential of functional GND for all inputs
Galvanic isolation to Analog Outputs, RS-485 / RS-422, Ethernet 250 Vac continuous; 1500 Vac for 1 minute RTD type (3 analog inputs for temperature sensors)
Pt-100 x K; Ni-100 x K; where K = 1..11 (K – multiplier, e.g.: K = 2 for Pt-200)
Sensor types
-200 .. +850 °C / -328 .. +1562 °F for Pt100 x K -60 .. +150 °C / -76 .. +302 °F for Ni100 x K
Measuring range
Sensor connection
4-wire (2-wire with wire bridges)
Wire resistance compensation
Automatic , additional manual in range -99.99 .. +99.99 W
Maximum resistance of connecting wires
50 W
A / C converter resolution
18 bit (24 bit Sigma-Delta ADC)
50 Hz / 60 Hz filter
Sinc3 digital filter
Damping (1 st order Low Pass Filter time constant)
2 s / 5 s / 10 s / 20 s / 30 s / 1 min / 2 min / 3 min / 5min
Measurement resolution
> 0.05% of reading or 0.1 Ω (TBV)
± 0.5 °C / ±0.9 °F (typical ± 0.3 °C / ±0.54 °F)
Accuracy (at T amb = +25 °C / +77 °F)
Temperature drift
Maximum ± 0.02 °C / °C / 0.036 °F / °F
± 40 Vdc / SELV
Max input voltage
Galvanic isolation between inputs
No; common potential of functional GND for all inputs
Galvanic isolation to Analog Outputs, RS-485 / RS-422, Ethernet 250 Vac continuous; 1 500 Vac for 1 minute
Technical data for the M850 series flow computers continued on next page
TI-P333-29 EMM Issue 5
Page 3 of 10
M850-W and M850-P Flow Computers
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