Boiler house Energy monitor
2
Technical data for the B850 series flow computers (continued)
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
M aximum resistance of connecting wires
50 W
2.12 5
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)
Maximum ±0.02 °C / °C / 0.036 °F/ °F
Temperature drift
± 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; 1500 Vac for 1 minute
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%
± 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
Configuration (default): OC or Contact open/closed
(Internal jumper J4/J5/J6 ON)
Open circuit voltage
5 Vdc
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
Technical data for the B850 series flow computers continued on next page
TI-P408-01 EMM Issue 6
Page 5 of 11
B850 Boiler House Energy Monitor
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