Boiler house Energy monitor
2
Technical data for the B850 series flow computers
User interface, front panel
Display type
LCD TFT color, 3.5", with LED backlight
Display size/resolution
43.8 mm x 77.4 mm/272 (RGB) x 480 px,
LED indication
3 two-color LEDs, red/green: ALARM, REC, USB
Keyboard
19 membrane buttons Inputs organization
6 x I type (0/4 - 20 mA):
IN1, IN2, IN3, IN4, IN5, IN6
2.12 4
Number of inputs
3 x RTD (4-wire):
IN7, IN8, IN9
3 x PULS:
IN10, IN11, IN12
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 B850) 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
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
Technical data for the B850 series flow computers continued on next page
TI-P408-01 EMM Issue 6
Page 4 of 11
B850 Boiler House Energy Monitor
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