PLF2000 Series
LIQUID FLOW SENSOR FOR WATER METERING
131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 |
[email protected] | www.posifatech.com
DESCRIPTION
Posifa designed the PLF2000 series of liquid flow sensors to replace mechanical turbine flow sensors. With a MEMS thermal flow die at its core, PLF2000 is far more accurate and repeatable, even when flow is pulsatile and provides a linear digital output. Because it has no moving parts, PLF2000 does not get stuck nor suffer mechanical breakdown. Cleaning does not require disassembly. Also, because it does not introduce an obstruction (i.e. turbine) in the flow path, it presents minimal flow resistance, making it possible to circulate liquid via gravity, a boiler, or a low-power pump.
PLF2000 features Posifa’s third-generation thermal flow die, benefiting from the latest innovations in microfabrication. The sensor die uses a pair of thermopiles to detect changes in temperature gradient caused by mass flow, delivering excellent signal-to-noise, and repeatability. The “solid state” thermal isolation structure eliminates the need for the surface cavity or fragile membrane used in competing technologies. The sensor die, with its silicon carbide protective film, is capable of direct contact with liquid, allowing the highest level of sensitivity and minimizing the cost of packaging.
PLF2000 complies with NSF/ANSI 61: Drinking Water System Components – Health Effects and can be used safely in water and beverage appliaces.
PLF2000 provides both analog (voltage) and digital I2C output.
APPLICATIONS
• Coffee and expresso machines • Water dispensers • Water purifiers and filtration systems • Beverage vending machines • Detergent vending machines • Cleaning chemical mixing systems • Liquid cooling systems
FEATURES
• No moving parts • Extremely fast response time (< 5 ms) • Can be used with pulsatile flow systems • Does not obstruct flow (low pressure drop) • Disassembly not required for maintenance
MAXIMUM RATINGS
• Operating Temperature: 5 °C to 75 °C • Storage Temperature: 5 °C to 80 °C • Operating Pressure: 50 psi
Datasheet_PLF2000_LiquidFlowSensor_Rev1_C6 | Nov 2020 | PAGE 1 OF 5
PLF2000 Series
LIQUID FLOW SENSOR FOR WATER MONITORING
131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 |
[email protected] | www.posifatech.com
SPECIFICATIONS
SPECIFICATIONS PLF2105 PLF2135
Test Conditions: Vin=5±0.01VDC, Ta=22°C.
MIN 50 100
TYP
MAX
UNIT
700
ml/min
10000 ml/min
CONDITIONS
Output Count (calibrated)
409 to 3686
count
Null Count (calibrated)
380
440
count
Output Count (raw)
30000 to 45000
count
Output (calibrated)
0.5 to 4.5
VDC
Flow Repeatability
0.5
% F.S.
Flow Response Time1
5
ms
Warm Up Time
5
sec
Operating Pressure
50
psi
Operating Temperature
5
75
°C
Storage Temperature
5
80
°C
Supply Voltage
5
5.5
VDC
Supply Current
15
mA at 5 VDC supply
Wetted Materials
NSF/ANSI 61 compliant nylon, silicone and food grade conformal coating
Notes: 1. 10% to 90% rise time of the flow sensor to electrically respond to any mass flow change. May be affected by the pneumatic interface.
Datasheet_PLF2000_LiquidFlowSensor_Rev1_C6 | Nov 2020 | PAGE 2 OF 5
PLF2000 Series
LIQUID FLOW SENSOR FOR WATER MONITORING
131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 |
[email protected] | www.posifatech.com
OUTPUT DESCRIPTION
For PLF2105
Calibration Conditions: 20 °C, supply = 5V, flow is driven from a centrifugal pump.
For PLF2135
Flow Output (ml/min) (volt)
0
0.5
85
1.71
100 1.78
150 1.96
202 2.20
303 2.60
402 2.92
503 3.15
602 3.27
702 3.35
Count
409 1362 1403 1572 1761 2103 2353 2535 2650 2715
Flow Output (ml/min) (volt)
0
0.51
100 1.05
1050 2.35
2390 2.89
3060 3.12
4240 3.38
5520 3.61
7060 3.75
9000 4.32
10000 4.52
Count
412 853 1890 2370 2510 2695 2930 3050 3370 3580
Calibration Conditions: 20 °C, supply = 5V, flow is driven from a pressurized tank. Datasheet_PLF2000_LiquidFlowSensor_Rev1_C6 | Nov 2020 | PAGE 3 OF 5
PLF2000 Series
WATER FLOW SENSOR FOR WATER MONITORING
131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 |
[email protected] | www.posifatech.com
PACKAGE DIMENSIONS
PLF2105
123456
PLF2135
Contact Posifa for sensor CAD model.
Pin# Description 1 VDD 2 GND 3 Out 4 SDA 5 SCL 6 N/C
Mating connector: JST S6B-PHSM4-TB or Equivalent
123456
Datasheet_PLF2000_LiquidFlowSensor_Rev1_C6 | Nov 2020 | PAGE 4 OF 5
PLF2000 Series
WATER FLOW SENSOR FOR WATER MONITORING
131 E. Brokaw Road | San Jose CA 95112 | +1 (408) 392-0989 |
[email protected] | www.posifatech.com
ORDERING INFORMATION
PART NUMBER PLF2105 PLF2135
SPECIFICATIONS 50 to 700 ml/min, voltge and digital I2C output 100 to 10000 ml/min, voltage and digital I2C output
Please contact Posifa to place an order.
CUSTOMIZATION OPTIONS
If the standard product described in this data sheet does not completely meet your needs, please contact Posifa Technolog.