Water flow sensor

The YF-B2 water flow sensor is compact in size and easy to install. The sensor is mainly composed of a plastic valve body, a water flow rotor assembly and a Hall sensor. It is installed at the water inlet end of the gas boiler to detect water flow.

Technical Specifications:

Operating voltage range: DC 5～18V
Minimum rated operating voltage: DC 5V
Maximum operating current: 15mA (DC 5V)
Load capacity: ≤ 10mA (DC 5V)
Operating temperature range: ≤80 ℃
Application humidity range: 35% to 90% RH (non-condensing)
Permissible pressure resistance: Water pressure below 1.75 Mpa
Storage temperature: -25 ～ +80 ℃
Storage humidity: 25% ～ 95% RH
Liquid temperature max: 120°C

Wiring connection:

JST connector

Red wire: IN
Yellow wire: OUT
Black wire: GND

Output specifications:

Output pulse high level: > DC 4.5 V (input voltage DC 5 V)
Output pulse low level: < DC 0.5 V (input voltage DC 5 V)
Fine output (Flow -- pulse output): 1～ 25L/min ±3 %
Output pulse duty cycle: 50±10%
Output rise time: 0.04 μS
Output fall time: 0.18 μS
Flow - pulse characteristics: Horizontal test pulse frequency (Hz)=[ 11* Q]± 5 % (horizontal test) (Q is flow rate L/min)

Resistance to environmental influences:

Impact resistance: the product is well packaged and shows no abnormalities when freely dropped from a height of 50 cm in the X, Y, and Z directions onto a concrete surface. Accuracy varies within 5%.
Insulation resistance: The insulation resistance between the Hall sensor and the copper valve body is more than 100 MΩ. (DC 500V)
Heat resistance: in an environment of 80 ± 3 ℃ for 48 hours, back to normal temperature for 1-2 hours without abnormalities, and the parts have no cracks, loosening, expansion, deformation and other phenomena, and the accuracy changes within 10%.
Cold resistance: in -20±3 ℃ environment for 48 hours, back to normal temperature for 1-2 hours without abnormality, and the parts have no cracks, loosening, expansion, deformation and other phenomena, and the accuracy changes

*Eight, flow --- pulse characteristics refer to the table F=11Q**
flow	pulse	error	min	max	flow	pulse	error	min	max
2	22	± 1.020	22.44	21.56	6.1	67.1	±3.2	68.44	65.76
2.1	23.1	± 1.021	23.59	22.64	6.2	68.2	±3.3	69.56	66.90
2.2	24.2	± 1.022	24.68	23.72	6.3	69.3	±3.4	70.69	67.91
2.3	25.3	±1.023	25.83	24.79	6.4	70.4	±3.5	71.81	69.06
2.4	26.4	±1.024	26.93	25.87	6.5	71.5	±3.6	72.93	70.07
2.5	27.5	±1.025	28.08	26.95	6.6	72.6	±3.7	74.05	71.22
2.6	28.6	±1.026	29.17	28.03	6.7	73.7	±3.8	75.17	72.23
2.7	29.7	±1.027	30.32	29.11	6.8	74.8	±3.9	76.30	73.38
2.8	30.8	±1.028	31.42	30.18	6.9	75.9	±3.10	77.42	74.38
2.9	31.9	±1.029	32.57	31.26	7	77	±3.11	78.54	75.54
3	33	±1.030	33.66	32.34	7.1	78.1	±3.12	79.66	76.54
3.1	34.1	±1.031	34.82	33.42	7.2	79.2	±3.13	80.78	77.70
3.2	35.2	±1.032	35.90	34.50	7.3	80.3	±3.14	81.91	78.69
3.3	36.3	±1.033	37.06	35.57	7.4	81.4	±3.15	83.03	79.85
3.4	37.4	±1.034	38.15	36.65	7.5	82.5	±3.16	84.15	80.85
3.5	38.5	±1.035	39.31	37.73	7.6	83.6	±3.17	85.27	82.01
3.6	39.6	±1.036	40.39	38.81	7.7	84.7	±3.18	86.39	83.01
3.7	40.7	±1.037	41.55	39.89	7.8	85.8	±3.19	87.52	84.17
3.8	41.8	±1.038	42.64	40.96	7.9	86.9	±3.20	88.64	85.16
3.9	42.9	±1.039	43.80	42.04	8	88	±3.21	89.76	86.33
4	44	±1.040	44.88	43.12	8.1	89.1	±3.22	90.88	87.32
4.1	45.1	±1.041	46.05	44.20	8.2	90.2	±3.23	92.00	88.49
4.2	46.2	±1.042	47.12	45.28	8.3	91.3	±3.24	93.13	89.47
4.3	47.3	±1.043	48.29	46.35	8.4	92.4	±3.25	94.25	90.64
4.4	48.4	±1.044	49.37	47.43	8.5	93.5	±3.26	95.37	91.63
4.5	49.5	±1.045	50.54	48.51	8.6	94.6	±3.27	96.49	92.80
4.6	50.6	±1.046	51.61	49.59	8.7	95.7	±3.28	97.61	93.79
4.7	51.7	±1.047	52.79	50.67	8.8	96.8	±3.29	98.74	94.96
4.8	52.8	±1.048	53.86	51.74	8.9	97.9	±3.30	99.86	95.94
4.9	53.9	±1.049	55.03	52.82	9	99	±3.31	100.98	97.12
5	55	±1.050	56.10	53.90	9.1	100.1	±3.32	102.10	98.10
5.1	56.1	±1.051	57.28	54.98	9.2	101.2	±3.33	103.22	99.28
5.2	57.2	±1.052	58.34	56.06	9.3	102.3	±3.34	104.35	100.25
5.3	58.3	±1.053	59.52	57.13	9.4	103.4	±3.35	105.47	101.44
5.4	59.4	±1.054	60.59	58.21	9.5	104.5	±3.36	106.59	102.41
5.5	60.5	±1.055	61.77	59.29	9.6	105.6	±3.37	107.71	103.59
5.6	61.6	±1.056	62.83	60.37	9.7	106.7	±3.38	108.83	104.57
5.7	62.7	±1.057	64.02	61.45	9.8	107.8	±3.39	109.96	105.75
5.8	63.8	±1.058	65.08	62.52	9.9	108.9	±3.40	111.08	106.72
5.9	64.9	±1.059	66.26	63.60	10	110	±3.41	112.20	107.91

Why choose this product?

Small size – Takes up little space
Easy to install – Quick to place according to the text
Detects water flow – Measures the water flow in use
For gas boiler – Suitable at the water inlet

Specifications

Connection	JST connector
Suitable for	gas boiler
Material	plastic
Type	YF-B2
Storage temperature	-25 ～ +80 ℃
Operating voltage range	DC 5～18V
Minimum rated operating voltage	DC 5V
Load capacity	≤ 10mA (DC 5V)
Operating temperature range	≤80 ℃
Application humidity range	35% to 90% RH (non-freezing)
Permissible pressure resistance	Water pressure under 1.75 Mpa
Storage humidity	25% ～ 95% RH
Max fluid temperature	120°C
Output pulse high level	> DC 4.5 V (input voltage DC 5 V)
Output pulse low level	< DC 0.5 V (input voltage DC 5 V)
Fine output (flow -- pulse output)	1～ 25L/min ±3 %
Output pulse duty cycle	50±10%
Output rise time	0.04 μS
Output fall time	0.18 μS
Operating current	15mA (DC 5V)