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Air Flow Monitor EWA2

Specifications

Common specifications

Item Specifications
Rated pressure range 0 to 1 MPa (gauge pressure)
Rated operating voltage 24V DC±10%
Power consumption 1.5 W or less
Pulse output Open drain output
・Max. inflow current : 50mA
・Applied voltage : 24V DC or less
・Residual voltage: 1.5 V or less
(at inflow current 50 mA)
  Output mode Direct flow pulse
Over current protection Equipped
Pulse output time Duty(1:1)
50/100/125/250/500ms
(select in setting mode)
Analog current output Output current: 4 to 20 mA
Output accuracy: ±0.1 mA
Max. external load: 400 Ω or less
  Output mode Instant flow, air pressure and temperature
(select in setting mode)
  Instant flow Zero point:
4 mA (Direct flow display mode, reverse flow ~ within low flow cut off)
12 mA (Direct/Reverse flow display mode, within low flow cut off)
Air pressure 0 kPa: 4 mA, 1 MPa: 20 mA
Temperature −10℃ +14 ℉ : 4mA, +60℃ +140 ℉ : 20mA
Pressure loss Extremely small (same as straight pipe)
Response time 500ms
Using environment Enclosure protection IP64(IEC)
Ambient temperature −10 to +60℃ +14 to +140 ℉
(Storage: -20 to +70 ℃ -4 to +158 ℉)
Ambient humidity 90 % RH or less
(No dew condensation or icing allowed)

* When installing the monitor in a horizontal pipe, install it with its display facing up.
It can also be installed to vertical pipings.

Individual specifications

Small pipe size type

Model No. AEWA2025 AEWA2032
Pipe size 25A (1B) 32A (1 1/4B)
Measurable fluids Air (compressed air), Nitrogen gas
Flow range Actual flow
[ m3/h ]
−0.6 to −35 or
+0.6 to +35
−1.1 to −65 or
+1.1 to +65
Normal flow*
[ Nm3/h ]
−4.3 to −250 or
+4.3 to +250
−8 to −470 or
+8 to +470
Flow measuring accuracy ±5%R.S.
[ m3/h ]
−0.6 to −3.5 or
+0.6 to +3.5
−1.1 to −6.5 or
+1.1 to +6.5
±2%R.S.
[ m3/h ]
−3.5 to −35 or
+3.5 to +35
−6.5 to −65 or
+6.5 to +65
Conversion accuracy ±2.5%R.S.〔at dry air or nitrogen gas (at 90 % RH or below), ordinary temperatures and 0.5 MPa〕
Unit for pulse output 10 / 100 / 1,000 [L/pulse]
Low flow cut off Within ±0.1m3/h Within ±0.2m3/h
Material Measuring pipe: Aluminum alloy, PPS, FVMQ
Net weight 1.5 kg approx. 1.4 kg approx.
Accessories M4 hexagon wrench: 1 pc

* With supply pressure 0.7 MPa and temperature in pipe at +25 ℃ +77 °F

Medium pipe size type

Model No. AEWA2040 AEWA2050 AEWA2065 AEWA2080
Pipe size 40A (1 1/2B) 50A (2B) 65A (2 1/2B) 80A (3B)
Measurable fluids Air (compressed air), Nitrogen gas
Flow range Actual flow
[ m3/h ]
−1.3 to −80
or
+1.3 to +80
−2.5 to −150
or
+2.5 to +150
−4 to −240
or
+4 to +240
−5 to −300
or
+5 to +300
Normal flow*
[ Nm3/h ]
−9.4 to −580
or
+9.4 to +580
−18 to −1,090
or
+18 to +1,090
−29 to −1,740
or
+29 to +1,740
−36 to −2,170
or
+36 to +2,170
Flow measuring accuracy ±5%R.S.
[ m3/h ]
−1.3 to −8
or
+1.3 to +8
−2.5 to −15
or
+2.5 to +15
−4 to −24
or
+4 to +24
-5 to −30
or
+5 to +30
±2%R.S.
[ m3/h ]
−8 to −80
or
+8 to +80
−15 to −150
or
+15 to +150
−24 to −240
or
+24 to +240
−30 to −300
or
+30 to +300
Conversion accuracy ±2.5%R.S.〔at dry air or nitrogen gas (at 90 % RH or below), ordinary temperatures and 0.5 MPa]〕
Unit for pulse output 10 / 100 / 1,000 [L/pulse]
Low flow cut off Within ±0.2m3/h Within ±0.4m3/h Within ±0.6m3/h Within ±0.8m3/h
Material Measuring pipe: Aluminum alloy, PPS, FVMQ
Net weight 1.0 kg approx. 1.2 kg approx. 1.4 kg approx. 1.7 kg approx.
Accessories Positioning collar: 4 pcs, M4 hexagon wrench: 1 pc, Flange packing: 2 pcs, Bolt set: 1 set (bolt, nut and plain washer)

* With supply pressure 0.7 MPa and temperature in pipe at +25 ℃ +77 °F

Large pipe size type

Model No. AEWA2100 AEWA2150 AEWA2200
Pipe size 100A (4B) 150A (6B) 200A (8B)
Measurable fluid Air (compressed air)
Flow range Actual flow
[ m3/h ]
−10 to −500
or
+10 to +500
−24 to −1,200
or
+24 to +1,200
−40 to −2,000
or
+40 to +2,000
Normal flow*
[ Nm3/h ]
−72 to −3,620
or
+72 to +3,620
−170 to −8,690
or
+170 to +8,690
−290 to −14,490
or
+290 to +14,490
Flow measuring accuracy ±5%R.S.
[ m3/h ]
−10 to −50
or
+10 to +50
−24 to −120
or
+24 to +120
−40 to −200
or
+40 to +200
±2%R.S.
[ m3/h ]
−50 to −500
or
+50 to +500
−120 to −1,200
or
+120 to +1,200
−200 to −2,000
or
+200 to +2,000
Conversion accuracy ±2.0 %R.S.〔at dry air (at 90 % RH or below), ordinary temperatures and 0.3 MPa〕
Unit for pulse output 100 / 1,000 / 10,000 [L/pulse]
Low flow cut off Within ±2.6m3/h Within ±5.0m3/h Within ±9.0m3/h
Material Measuring pipe: Stainless alloy, PPS and FVMQ
Net weight 10.3kg approx. 18.3kg approx. 24.4kg approx.
Accessories Positioning collar: 2 pcs, M4 hexagon wrench: 1 pc

* With supply pressure 0.7 MPa and temperature in pipe at +25 ℃ +77 °F

Communication specifications

Item Specifications
Interface Conforming to EIA-485
Protocol Modbus RTU
Communication method Half-duplex
Synchronous system Synchronous communication method
Number of connected units 115,200 bps: Max. 8 units
9,600/19,200/38,400/57,600 bps: Max. 31 units
Transmission speed 9,600/19,200/38,400/57,600/115,200 bps
(select in setting mode)
Transmission format Data length 8 bit
Stop bit 1 bit/2 bit
Parity None/Odd number/Even number
Data buffer 100 byte
Response time 9,600bps: 100 to 130ms
19,200bps: 70 to 100ms
38,400bps: 50 to 80ms
57,600bps: 40 to 70ms
11,5200bps: 40 to 70ms
Ending resistance 100 Ω approx. (built-in)
(select in setting mode)

* The number of connectable units, transmission distance, and transmission speed may differ depending on the device to be connected and transmission path. Please confirm using the actual device.

■Note on installation
When installing the monitor in a horizontal pipe, install it with its display facing up. It can also be installed to vertical pipings.

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