Home » Products » Heat Meter » Oscillating heat meter
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I. Working principle
Digital Flow Meter uses the principal that jet flow has coanda effect in the oscillation chamber with special structure to control flow’s feedback, and in this way to make the jet flow switch between the two feedback channels. Oscillation frequency is proportional to the rate of flow, so if the oscillation chamber structural parameter is determined, a measure of total flow is derived from the measured Oscillation frequency.
II. Features
• No moving / mechanical element.
• Unaffected by grit or particulates.
• Does not measure air flow.
• Outlasts more than conventional mechanical water meters.
• Remain high accuracy over life-time.
• Clear and easy to read LCD display.
• Least count: 0.01 Litre
III. Technical Data
1. Water meter nominal diameter: DN15mm
2. DimensionsDn
Length(L)
Breadth(B)
Height(H)
Connecting Thread
mm
d
D
15
110
82
113
R1/2
G3/4
20
130
82
113
R3/4
G1
3. Flow related parameters
DN/Flow
R
Q4
Q3
Q2
Q1
l/h
15
80
1600
1000
32
20
15
160
3125
2500
25
15.6
20
160
5000
4000
40
25
4. Accuracy: According to ISO 4064-2005
5. Water temperature: ≤ T50;
6. Pressure loss: ΔP≤0.063MPa;
7. Maximum working pressure: 1.6MPa;
8. Batteries life: 7 years.
IV. . Maximum Permission error:
In the upper zone (Q2≤Q≤Q4):
1) Maximum permission error is ±2% at the temperature ≤30˚C
2) Maximum permission error is ±3% at the temperature ≥30˚C
In the lower zone (Q1≤Q≤Q2), maximum permission error is ±5%.
V. Installation
1. A length of more than 10 times of nominal diameter inlet straight pipe and 5 times of nominal diameter outlet straight pipe should be installed.
2. Water flow should be in the same direction with the arrow on water meter main case; If installed horizontally (or vertically), water meter surface should face right upwards (or right ahead), and it can not have any deflection from water meter outlet axis.
3. The installation location should be protected from sunlight, freezing; pollution and water drown for easy removing.
4. Flush the pipe work thoroughly to clear all impurities before install the water meter.
5. The water meter and pipeline should be connected by pipefitting, sealing gaskets and plastic connecting nuts. The water meter should not be removed by force to prevent the damage to the water meter cover.
6. Full Plastic Body Vision and Full Brass Body Vision
