The Spirax Sarco PA20 capacitive level preamplifier uses an austenitic stainless steel body and is specifically designed to convert the signal from a capacitive sensor into a 1-6 Vdc proportional voltage output. The product supports 3 sensitivity settings and DIN43650 electrical connection, compatible with voltage input controllers. It is suitable for capacitive level measurement and voltage input control loops, enabling continuous level measurement.
PA20 product photo
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Spirax Sarco PA20 Capacitive Level Preamplifier
Capacitive level preamplifier, outputs 1-6 Vdc voltage signal, supports three sensitivity levels.
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Specifications
- Applicable sensor type
- Capacitive sensor
- Compatible controller type
- Voltage input controller/transmitter
- Output signal
- 1-6 Vdc voltage output proportional to level
- Supply voltage
- 15-36 Vdc
- Maximum operating current
- 10 mA
- Output resistance
- 100 Ω
- Sensitivity setting
- 3 levels
- Maximum ambient temperature
- 70 °C
- Maximum cable length
- 100 m
- Electrical connection
- DIN43650 plug with Pg11 cable gland
- Body material
- Austenitic stainless steel ASTM A582 303
Application scenarios
Capacitive level measurement and voltage input control loop
The PA20 is installed on a Spirax Sarco capacitive sensor, converting capacitance changes into a 1-6 Vdc voltage output proportional to the level, and connecting to a compatible voltage input controller or transmitter for continuous level measurement.
FAQ
What is the main function of the PA20 preamplifier?
The PA20 is used with Spirax Sarco capacitive sensors to amplify the measured capacitance and convert it into a voltage output proportional to the level.
What controllers or transmitters can the PA20 be used with?
The PA20 is compatible with all Spirax Sarco voltage input controllers and transmitters.
What are the electrical parameters of the PA20?
The supply voltage is 15-36 Vdc, the maximum required current is 10 mA, the output voltage is 1-6 Vdc, and the output resistance is 100 Ω.
How should the PA20 be installed?
Screw the PA20 onto the capacitive sensor and hand-tighten; the O-ring is used to ensure a watertight seal. It must not be installed outdoors without protection.
What are the usage limits and maintenance requirements of the PA20?
The maximum ambient temperature is 70 °C, and the maximum cable length is 100 m. The equipment requires no special maintenance, but the boiler level control system should be inspected periodically.