The A2G-40 differential pressure switch is designed for ventilation and air-conditioning applications.
It measures the pressure difference between two points in air systems.
The device activates an electrical contact when the set differential pressure is reached.
It is commonly used to monitor air filters, fans, and airflow in HVAC systems.
The A2G-40 helps detect clogged filters and airflow blockages.
It ensures efficient system performance and proper air circulation.
The switch features adjustable setpoints for precise control.
It is built with durable materials for reliable long-term operation.
The A2G-40 is easy to install and suitable for various HVAC environments.
Overall, it enhances safety, efficiency, and monitoring in ventilation and air-conditioning systems.The WIKA Model A2G-40 differential pressure switch is a reliable, robust, and easy-to-install monitoring device for HVAC systems, designed to measure differential pressure, vacuum, or overpressure in air and non-aggressive gases. Key applications include filter monitoring, fan tracking, and air damper control, featuring six distinct, adjustable pressure ranges from 20 Pa to 4, 500
Switch point accuracy Pressure range Lowest limit Highest limit Switch differential
20 ... 200 Pa
[0.08 ... 0.8 inWC]
±8 Pa
[±0.03 inWC]
±15 % 20 Pa
[0.08 inWC]
30 ... 300 Pa
[0.12 ... 1.20 inWC]
±8 Pa
[±0.03 inWC]
±15 % 25 Pa
[0.10 inWC]
30 ... 500 Pa
[0.12 ... 2.00 inWC]
±8 Pa
[±0.03 inWC]
±15 % 25 Pa
[0.10 inWC]
40 ... 600 Pa
[0.16... 2.41 inWC]
±8 Pa
[±0.03 inWC]
±15 % 35 Pa
[0.14 inWC]
100 ... 1, 500 Pa
[0.40 ... 6.02 inWC]
±20 Pa
[±0.08 inWC]
±15 % 80 Pa
[0.32 inWC]
500 ... 4, 500 Pa
[2.00 ... 18.08 inWC]
±100 Pa
[±0.40 inWC]
±15 % 250 Pa
[1.00 inWC]
Unit ■ Pa
■ kPa
■ inWC
■ mmWC
■ mbar
Maximum operating pressure ■ Test pressure: 25 kPa [100 inWC]
■ Burst pressure: 50 kPA [200 inWC]
Process connection Connecting nozzle, side mount, for hoses with inner diameter 4 ... 6 mm [0.16 … 0.24 in] (see „Accesso-
ries“)
Electrical connection Cable gland M16
Screw terminals max. 1.5 mm² [0.002 in²]
Switching power
Voltage Pressure range 20 ... 200 Pa All other pressure ranges
Resistive load
(cos φ ≈ 1)
Resistive load
(cos φ ≈ 1)
Inductive load
(cos φ ≈ 0.6 - 0.7)
AC 125 V 0.1 A 3 A 2 A
AC 250 V 0.1 A 3 A 2 A
DC 30 V 0.1 A 3 A 2 A
DC 125 V- 0.4 A 0.05 A
Mounting type Wall mounting
Materials
Case Plastic (ABS)
Window Polycarbonate (PC)
Diaphragm Silicone
Seals Plastic
Permissible temperatures
Medium -20 ... +60 °C [-4 … +140 °F]
Ambient -20 ... +85 °C [-4 … +185 °F]
Relative humidity, condensation 0 ... 95 % r. h., non-condensing
Ingress protection per
IEC/EN 60529
IP54
Weight 150 g [0.33 lbs]
System Type Ventilation system
Pressure Switch Type Differential Pressure Switch
Tonnage 5 TR
Application Industrial, Retail, Hotel, Office, Residential, Data center, Hospital, Warehouse
Contact Material Silver
Cooling Medium Evaporative
Star Rating 5 star
Power Supply 230V 1Ph 50Hz
Media Type Air
Accuracy A2G - 40 AS PER ATTACHED CATALOGUE SP69.02
