Aquameta™ PT420-0.5EFE

Hydrostatic chemical level sensor

  • Description
  • Technical specifications
  • Downloads

The PT420 series of 4-20mA pressure transducers are a cost effective and robust solution designed for continuous level measurement where a 4-20mA output is required. It may be used with other liquids that are compatible with its wetting materials which are Polyethylene, EPDM, FEP and PTFE. Different choice of seals is available for other applications. The PT420-0.5EFE is suitable for pressure application of 0.5 bar (5.1m H2O). 1 and 10 bar options are available. The sensor includes temperature and barometric pressure compensation.

Transducer Construction
This state of the art pressure sensor uses a flush PTFE coated Ceramic diaphragm in conjunction with on-board signal conditioning to measure pressures. Pressure and temperature calibration is done electronically with the internal application-specific integrated circuit (ASIC). When pressures and temperatures change, the electronics provide an offset and span correction. It also includes aging detection and compensation. This new method guarantees good precision and long term stability.
The sensor is encapsulated in a Polyethylene body that is filled with an epoxy.
The sensor cable is molded into the transducer eliminating problems associated with threaded plugs. This design ensures a very high level of reliability.


  • 4-20mA output
  • 9 to 30V
  • Temperature compensated
  • Barometric pressure compensation via vented cable
  • High linearity and low hysteresis values
  • EMI Certified
  • Excellent resistance to corrosion and abrasion
  • Automated offset and span correction
  • Age compensation

Output Signals
The PT420 transducer uses a two wire 4-20mA output signal. The signal is linear with pressure. The sensor will operate with a supply voltage that can range from 9V to 30V DC. The Aquameta Junction box may be used to extend the transducer cable with any other cable. The vented junction box has a Gortex covered opening that allows venting to atmosphere to take place whilst restricting the ingress of moisture.


  • Level measurement in above and underground tanks
  • Suitable for tanks with firefighting foam concentrate containing Diethylene Glycol Butyl Ether

Supply Voltage 9 to 30V DC
Output 4-20mA
Vacuum Capability -0.1 bar
Overload 1 bar
Burst Pressure 2 bar
Operating Temperature 0°C to 65°C
Full Scale (FS) 20mA at 0.5bar (5.1m H20)
Linearity and Hysteresis ±0.4% FS
Accuracy 0.5% max at 25°C (Typical 0.25%) 2% max 0 to 65°C (Typical 1%)
Operating Range 0 to 0.5 bar (0 to 5.1m H2O (16.7ft))
Over Pressure Do not submerge beyond a depth of 10m as damage to sensor will occur
Electronic Protection Reverse and over voltage protection
Cable Jacket FEP
Cable 4 conductors 25AWG. (Red +, Black -, Blue and White not used)
Cable O.D. 6.5mm
Cable Termination Bare wire tinned
Standard cable length 2m
Wetted Materials Polyethylene, EPDM, Aluminum Oxide, FEP

The following downloads are available for the Aquameta™ PT420-0.5EFE
Download Aquameta™ PT420-0.5EFE PDF