Senseca

HD408T Pressure Transmitter

Analog pressure transmitters for relative or differential monitoring of air and non-aggressive dry gases.

Pressure fields from 10 mbar to 200 mbar, with ±0.5 % f.s. accuracy at 20 °C
4…20 mA current output (HD408T) or 0…10 Vdc, 0…5 Vdc and 1…5 Vdc voltage output (HD4V8T)
IP67 polycarbonate blend (PC + ABS) housing, factory calibrated and ready to use

Quantity

Overview

Clean rooms, ventilation systems and filter monitoring need stable low-pressure data without complicated setup. HD408T and HD4V8T transmit relative or differential atmospheric pressure for non corrosive air and gas, with pressure fields from 10 mbar to 200 mbar.

The piezoresistive sensor delivers precise, stable measurements with excellent repeatability, low hysteresis and very good temperature stability. Factory calibration makes the transmitters ready to use, while the output is conditioned as 4…20 mA for HD408T or voltage output for HD4V8T, linearly proportional to the applied differential pressure.

For demanding installations, the sensor and electronics sit inside a polycarbonate blend (PC + ABS) housing with ingress protection (IP) IP67. The transmitters mount on a panel or wall and connect via Ø 5 mm flexible tube.

Typical applications

Clean room pressure monitoring
Filter control
Pitot tube flow measurement
Packing machines
Ventilation control

Key Features

Relative and differential models: relative pressure from 0…+f.s. and differential pressure from -f.s…+f.s.
Analog output variants: HD408T provides a 4…20 mA current output; HD4V8T provides voltage outputs depending on the model: 0…10 Vdc, 0…5 Vdc or 1…5 Vdc
Pressure connection with a Ø 5 mm flexible tube for air and non aggressive dry gases
Mounting and adjustment: the housing can be secured directly to a panel or wall, and models below 100 mbar f.s. include external access for zero adjustment
Can be mounted in any position; the zero deviation due to mounting position is, in the worst case (10 mbar range), less than 1% f.s. and can be corrected with the regulating potentiometer
Operating conditions: works from -20…+60 °C and stores from -20…+80 °C, with overpressure limits defined by the selected range

Benefits

Stable readings: piezoresistive sensor offers low hysteresis and ±0.5 % f.s. accuracy at 20 °C
Ready to install: factory calibration reduces setup effort for relative or differential pressure monitoring
Robust housing: IP67 PC + ABS case protects sensor and electronics in industrial installations
Flexible output: choose 4…20 mA or 0…10 Vdc, 0…5 Vdc and 1…5 Vdc model outputs

Specifications

MEASUREMENT SPECIFICATIONS @ 20 °C AND 24 VDC
Sensor	Piezoresistive
Measurement range	10, 20, 50, 200 mbar ±10, ±20, ±50, ±200 mbar
Accuracy	±0.5 % f.s. @ 20 °C
Temperature drift	< 1% f.s., zero < 1% f.s., span from -20 to +60 °C (from -4 to 140 °F)
Long-term stability	< 1 % f.s. over 6 months at 20 °C
Startup time	1 sec. at 99% of full scale reading
Response time	< 10 ms until it reaches the stated precision by applying a step pressure level
Compatible media	Only air and non aggressive dry gases
Overpressure limit	350 mbar for the models 10, 20, 50 mbar 3 x f.s. for the 200 mbar model

ELECTRICAL SPECIFICATIONS
Output	4…20 mA (HD408T) 0…10 Vdc, 0…5 Vdc, 1…5 Vdc, depending on the model (HD4V8T)
Power supply	HD408T: 8…30 Vdc HD4V8T: 16…40 Vdc or 24 Vac with output 0…10 Vdc; 10…40 Vdc or 24 Vac with outputs 0…5 Vdc, 1…5 Vdc
Absorption	HD408T: < 4 mA HD4V8T: 20 mA @ 20 °C, 24 Vdc
Load resistance	HD408T: RLmax = 727 Ω @ 24 Vdc; RLmax = (Vdc - 8) / 22 mA HD4V8T: minimum input resistance 10 kΩ
Electric connection	Screw terminal box

PHYSICAL SPECIFICATIONS
Working temperature	-20…+60 °C
Storage temperature	-20…+80 °C
Pressure connection	With Ø 5 mm flexible tube
Housing	Material: Polycarbonate blend (PC + ABS) Dimensions: 66 x 60 x 35 mm
Weight	≈ 120 g depending on the model
Protection degree	IP67