Dwyer Instruments UFM2 - 6 Appendix; Specification

UFM2/UBT User Manual
Page 34 Issue 1.1b July 20
6 APPENDIX
6.1 Specification
General
Measuring Technique
Transit time
Measurement channels
1
Timing Resolution
±50ps
Turn down ratio
200:1
Flow velocity range
0.33 – 32.8 ft/s (0.1 to 10m/s)
Applicable Fluid types
Clean water with < 3% by volume of particulate content, or up to
30% ethylene glycol.
Accuracy
±3% of flow reading for velocity rate >0.98 ft/s (0.3 m/s)
Repeatability
±0.15% of measured value
Pipe Ranges
3/4-4" (25-115mm) OD and
5-7" (125-180mm) OD
Note: Pipe size is dependent on pipe material and internal diameter.
Selectable units for USCS
Velocity: ft/s
Flow rate: gal/min, gal/hr, USgal/min, USgal/hr
Volume: gals, USgals
Selectable units for metric
Velocity: m/s
Flow Rate: l/s, l/min, m
3
/min, m
3
/hr
Volume: litres, m
3
Totaliser
14 digits with roll over to zero
Languages supported
English only
Power input
12 – 24V DC or 24V AC
Power consumption
7W DC or 7VA AC maximum
Cable
16.4 ft (5m) screened 6 core
Pulse Output
Output
Opto-isolated MOSFET volt free contact (NO/NC).
Isolation
1MΩ @ 100V
Pulse width
Default value 50ms; programmable range 3 – 99ms
Pulse repetition rate
Up to 166 pulses/sec (depending on pulse width)
Frequency mode
200 Hz maximum (Range 1-200)
Maximum load voltage/current
24V DC or 24V AC / 500mA
Current Output UFM2 only (if fitted)
Output
4 – 20mA
Resolution
0.1% of full scale
Maximum load
620Ω
Isolation
1MΩ @ 100V
Alarm current
3.5mA
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