Flowmetering
Flowmetering ancillaries
PULS type inputs (binary / pulse / frequency)
Measuring range
Minimum pulse width
Accuracy for frequency measurement (at T
amb
= +25 °C / +77 °F)
Maximum input voltage
Galvanic isolation between inputs
±40 Vdc / SELV
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
Configuration (default): OC or Contact open / closed
(Internal jumper J4 / J5 / J6 ON)
Total accuracy of compensated steam, water, other liquid or
technical gas flow measurement
Number of outputs
Galvanic isolation to Analog Inputs, RS-485 / RS-422, Ethernet
Typical: better then ± 0.5% (worst case: better then ± 2%)
4 - 20 mA analog output (optional)
1 or 2
Output signal
4 - 20 mA passive (external current loop supply required)
Resolution
16 bit DAC
Loop resistance (R
L
) range for U
CC
= 24 V
0 .. 600 Ω
Minimum loop power supply voltage
U
CCmin
= RL x 0.022 + 8
Maximum loop power supply voltage
28 Vdc / SELV
Accuracy (at T
amb
= +25 °C / +77 °F)
Better than ± 0.2% of FS / °C
Temperature drift
Maximum ± 0.02% of FS / °C
250 Vac continuous; 1500 Vac for 1 minute
Binary outputs (M850-W-x and M850-W-x-UL)
Number of outputs
4
Type of outputs
3 pole (COM, NO, NC) electromechanical relay
Contact rating (resistive load)
3Aat85..250Vac / 30Vdc
Maximum switching voltage
250 Vac / 125 Vdc
Maximum switching power
Number of outputs
Type of outputs
Binary outputs (M850-P-x)
750VA / 90W
4
2 pole Solid State Relay
Contact rating (resistive load)
0.1 A at 24 Vac/dc (max 42 Vac 60 Vdc) / SELV
Maximum ON resistance
20 Ω
Galvanic isolation (optoisolation)
250 VAC continuous; 1500 Vac for 1 minute
TI-P333-29 EMM Issue 4
Page 3 of 6
M850-W and M850-P Flow Computers
0 .. 20 kHz (cut off for f < 0.001 Hz)
(0 ..1 kHz with filter jumper J1 / J2 / J3 ON)
25 μs (0.5 ms with filter jumper J1 / J2 / J3 ON)
0.02%
Open circuit voltage
5 Vdc
Short circuit current
5 mA
On / off threshold
2.7V / 2.4V
Configuration: Voltage Input
(Internal jumper J4 / J5 / J6 OFF)
Signal amplitude
4 .. 36 Vdc
On / off threshold
2.7V / 2.4V
3.5.4
Input resistance
≥10 kW
Compensated flow and heat energy measurement
Calculation update rate
1s
