Manufacturer of Level Switch, Level Transmitter,
Detector and Sensor DITECH,LTD.
DITECH,LTD.
Weir type Flowmeter
QBS-FM
NSB-FM
proof
construction
Non-explosion-proof
Intrinsically safe construction(i3nG5)
measured
flow rate in waterway |
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The Water Pollution Control Law obligates businesses that emit 50 m3 or more per day of wastewater or that are subject to the wastewater quality standards, to conduct water quality inspections at a frequency determined by the amount of wastewater emitted. Using a triangular or rectangular weir, this weir type flowmeter accurately determines the amount of wastewater emitted by continuously measuring the hydraulic head.
This flowmeter may also be used for measuring the flow rate in water channel where the weir can be installed.
The detector has an original structure, in which a cylindrical compensating probe (guard probe) wrapped with a cylindrical function pattern electrode is protected by a plastic covering.
The hydraulic head of the weir (H) and the flowrate (Q) of the flowing wastewater are determined by the following formulae.
Q=RHn Triangular weir n＝5/2 Rectangular weir n＝3/2
Using a capacitive function probe, this weir type flowmeter converts the capacitance that occurs due to changes in the hydraulic head directly into a standardized electrical signal proportional to the flow rate.
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Extremely strong cylindrical probe
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Guard probe minimizes the influence from the adhering substance
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Easy-to-fabricate function probe suitable for all kinds of weir and also easy to install to existing weirs
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No moving parts ensure a long service life
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Can be combined with intrinsically safe transducers
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Simple maintenance
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Low initial cost and low maintenance cost
| Measurement system | Weir system＋Capacitance system |
| Measurement accuracy | Within ±1.5% (FS) |
| Output signal | DC4～20mA DC1～5V ※ One of the above signal |
| Input power | Model QBS-FM (Model PS-0FM)： AC105V/210V 50/60Hz or DC24V Model NSB-FM (Model PS-2)： AC105V/210V 50/60Hz |
| Power consumption | 10W |
| Allowable temperature | Detector： Depends on the specifications Transducer： Model PS-0FM： －10℃～＋50℃ Transducer： Model TR-2FM： －25℃～＋70℃ Power source： Model PS-2： －10℃～＋50℃ Special cable： Model DSC-15 (high accuracy use)： －10℃～＋60℃ Special cable： Model DSC-05 (small size)： －10℃～＋60℃ Special cable： Model DSC-13 (heat resistance use)： －50℃～＋200℃ |
| Allowable load | Detector : Depends on the specifications |
| Weight | Transducer： Model PS-0FM： 5.5kg Transducer： Model TR-2FM： 4.3kg Power source： Model PS-2： 7.6kg |
| Size | Transducer： Model PS-0FM： 216(W)×125(D)×259(H) Transducer： Model TR-2FM： 200(W)×149(D)×220(H) Power source： Model PS-2： 250(W)×145(D)×275(H) (mm) |
| Installation | Detector： Flange mounting Screws mounting, etc. |
| Material | Detector： SUS304 PTFE, etc. Lining： PTFE Glass Rubber, etc. Head case： Light alloy SUS304 Salt resistant paint case, etc. |
Model QBS-FM
(Non-explosion-proof type)
＜Separated transducer type＞
This model is composed of detector unit installed in water channel, transducer and special cable.
Model NSB-FM
(Intrinsically safe construction / i3nG5)
＜Totally separated detector unit type＞
This model is composed of detector unit installed in water channel, transducer, relay power source and special cable that is 4 core control cable. As the transducer is designed to be installed in a dangerous area, the special cable can be made short enough to minimize picked-up noises, thus permitting a stable performance to be obtainable. As to performance, this model has the same characteristics as those of Model QBS-FM.
