Flowmetering Flowmetering ancillaries 3
Technical data for the M850 series flow computers (continued)
PULS type inputs (binary / pulse / frequency)
0 .. 20 kHz (cut off for f < 0.001 Hz) (0 ..1 kHz with filter jumper J1 / J2 / J3 ON)
Measuring range
Minimum pulse width
25 μs (0.5 ms with filter jumper J1 / J2 / J3 ON)
Accuracy for frequency measurement (at T amb = +25 °C / +77 °F) 0.02% Maximum input voltage
± 40 Vdc / SELV
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
Configuration (default): OC or Contact open / closed
(Internal jumper J4 / J5 / J6 ON)
Open circuit voltage
5 Vdc
3.5 4
Short circuit current
5 mA
On / off threshold
2.7 V / 2.4 V
Configuration: Voltage Input
(Internal jumper J4 / J5 / J6 OFF)
Signal amplitude
4 .. 36 Vdc
On / off threshold
2.7 V / 2.4 V
Input resistance
≥10 k W
Maximum switching power
750 VA / 90 W Compensated flow and heat energy measurement
Calculation update rate
1 s
Total accuracy of compensated steam, water, other liquid or technical gas flow measurement
Typical: better then ± 0.5% (worst case: better then ± 2%)
4 - 20 mA analog output (optional)
Number of outputs
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
U CCmin = RL x 0.022 + 8
Minimum loop power supply voltage
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
Galvanic isolation to Analog Inputs, 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 4 of 10
M850-W and M850-P Flow Computers
Powered by FlippingBook