KATLAX Differential Pressure Transducer – Technical Specifications, Working Principle and Applications

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KATLAX Differential Pressure Transducer – Technical Specifications, Working Principle and Applications

In this article, we discuss the KATLAX Differential Pressure Transducer, including its technical specifications, material construction, electrical and measurement parameters, wiring details, display features, operation method, and practical applications. 
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Technical Specifications and Working Principle

This guide will help technicians, engineers, and students understand how the device works and how it is used in real-world systems such as air handling units, clean rooms, and industrial process control.

BASIC OVERVIEW

  • Differential pressure measurement plays an important role in modern HVAC, industrial automation, and process control systems.
  • A Differential Pressure Transducer (DP Transducer) measures the pressure difference between two pressure inputs and converts that difference into an electrical output signal (such as voltage, current, or digital signal).
  • Katlax produces two types of pressure transducers differential and Absolute.
  • Differential pressure transducer measures pressure differences between two points and give proportional analogue output (0 to 10V or 4-20 mA). 
  • This device can communicate on different communication protocol i.e. MODBUS, RS232, and RS485 etc. 
  • Katlax differential pressure transducers are available with various measuring ranges starts from -0.5 mbar to 100 mbar. 
  • These devices are available without Display & with LCD Display.
  • Absolute pressure transducer measures pressure with respect to vacuum or ambient pressure. 
  • Katlax will offer pressure transducers upto 100 bar pressure.
Differential pressure measurement

MATERIAL SPECIFICATION

Housing Material: Engineering Plastic-PC
  • It means that the outer body (casing) of a product is made from polycarbonate (PC), which is a type of engineering-grade plastic.
  • Model No: PTA230DPT252C5ADS
Degree of Protection: IP65
  • Ingress Protection 65 means the device is fully protected from dust and can handle rain and splashes, but it should not be submerged in water.
6 - Completely dust-tight (no ingress of dust),
5 - Protected against low pressure water jets from any direction. (limited liquid entry).
Degree of Protection IP65  

Mounting: Through Clamp 
  • It means the device is installed by passing a clamp through a hole or opening and tightening it to hold the device securely in place.
Pressure Input: Through Nozzle
  • It means that the pressure is measured via a nozzle connection (a small port or tube opening) on the device.
  • The nozzle connection allows tubing to be attached, which carries the pressure from the measurement point to the device.
Nozzle Diameter: 4 mm
  • It means that the internal diameter of the nozzle opening is 4 millimeters.
Nozzle Material: Brass
  • It means that the nozzle is made from brass metal.
  • The pressure connection port of the device is made from brass metal for durability, corrosion resistance, and reliable tubing connection.
Pressure Connection

Pressure Connection: Through Pipe O.D. 6.5 mm: I.D. 4 mm,
  • The device should be connected using a pressure tube with 6.5 mm outer diameter and 4 mm inner diameter.
The transducer has two pressure ports:
High Pressure Port (P1 or +),
Low Pressure Port (P2 or −),

Termination: Through PG9 Gland,
  • It means that the electrical wires or cables must enter the device through a PG9 cable gland for connection (termination).
Operating Temperature is 0°C to 55°C
  • This means the device can work normally and reliably only within this temperature range.
If the ambient temperature:
  • Below 0°C the device may not function correctly or may stop working.
  • Above 55°C it may overheat, malfunction, or get damaged.
Storage Temperature is 0°C to 70°C,
  • This refers to the temperature range in which the device can be stored when it is NOT operating.
  • The device can be stored in a warehouse, transport container, or inventory stock without damage.
  • However, the device should not be powered or operated at 70°C.
Housing Size is Height 125 mm, Width 122 mm , Depth 75 mm,

WIRING SPECIFICATIONS

  • Terminal 14 (NO2): Normally Open (NO) contact of Relay 2, 
  • Terminal 13 (NC2): Normally Closed (NC) contact of Relay 2, 
  • Terminal 12 (C2): Common (C) contact of Relay 2, 
  • Terminal 11 (NO1): Normally Open (NO) contact of Relay 1, 
  • Terminal 10 (NC1): Normally Closed (NC) contact of Relay 1, 
  • Terminal 9 (C1): Common (C) contact of Relay 1, 
  • Terminal 2 (N): Neutral connection, 
  • Terminal 1 (L): Line (Phase) – 230V AC supply,
Wiring Connection

ELECTRICAL SPECIFICATION

Operating Voltage: 230 Volt AC at 50 Hz + 10%,
  • 230 volts AC (Alternating Current) supply is required to operate the device.
  • 50 Hz (Hertz) refers to the frequency of the AC power supply.
  • The device can operate safely if the voltage varies 10% above or below 230 V, the device will work properly between 207 V and 253 V AC.
Output 2 Relay,
  • The device can switch or control two separate electrical loads using two internal relay switches.
Contact Type: 2 SPDT,
  • 2 SPDT (Single Pole Double Throw) it means the device has two independent SPDT relay contacts.
Contact Rating: 5 amps,
  • It means the maximum electrical current that the relay contacts can safely switch or carry is 5 amperes (5 A).

MEASUREMENT SPECIFICATION

Pressure Range 0 to 25 mbar,
  • It means the device can measure or operate within a pressure range from 0 millibar up to 25 millibar.
Set Point: 2 – Settable,
  • It means the device has two adjustable set points that the user can configure according to the required operating conditions.
Accuracy: 1% FS,
  • It means the device’s measurement error is within ±1% of the Full Scale (FS) value.
Linearity Error is Maximum 3%
  • It means the maximum deviation of the sensor’s output from a perfect straight-line response is 3% of the full scale.
Over Pressure: Maximum 3 mbar,
  • It means the maximum extra pressure the device can tolerate beyond its rated pressure range without damage is 3 mbar.
Normal maximum pressure = 25 mbar
Allowed overpressure = 3 mbar
So the absolute maximum pressure the device can tolerate is: 
25 mbar + 3 mbar = 28 mbar

Display Type: LCD (1 Line 8 Character),
  • It describes the type and capacity of the display used in the device.
  • LCD (1 Line 8 Character) = A small display that shows one line of information with a maximum of 8 characters at a time.
Display Type LCD 1 Line 8 Character

Display Unit is m bar, Pa , kPa , mWC , mmHg.
  • It means the device can show pressure readings in different measurement units, and the user can select the preferred unit on the display.
Full Form:
  1. Pa - pascal,
  2. kPa - Kilopascal,
  3. mbar - millibar,
  4. mWC - Meter of Water Column, 
  5. mmHg - millimeter of Mercury,

DISPLAY:

  • S1: Setting Button
  • S2: Setting Button
  • S3: Setting Button
  • Display: LCD, 1 Line, 8 Characters
  • Power LED: Indicates power supply status
  • Relay 1 LED: Indicates the status of Relay 1
  • Relay 2 LED: Indicates the status of Relay 2
KATLAX Differential Pressure Transducer Operation

OPERATION

  1. Press and hold the S1 button for a few seconds to enter the Settings Menu.
  2. Press the S1 button repeatedly to navigate through the available options: [Unit, Range, and Hysteresis].
  3. To enter the Range setting, press the S3 button.
  4. The Low Range Value will appear on the display, and the first digit will start blinking.
  5. Press the S2 button to increase the digit value (0–9).
  6. Press the S1 button to move the cursor to the next digit from left to right.
  7. After entering the required value, press the S3 button to save the setting.
  8. Repeat the same procedure to set the High Range Value.
  9. Follow the same process for configuring the Unit and Hysteresis settings.
  10. After completing all settings, the device will automatically return to the main display screen.

RELAY FUNCTION

Relay 1 (R1):
  • When the actual value rises above the Low Range setpoint, Relay 1 turns OFF.
  • When the actual value falls below the High Range setpoint, Relay 1 turns ON.
Relay 2 (R2):
  • When the actual value rises above the Low Range setpoint, Relay 2 turns ON.
  • When the actual value falls below the High Range setpoint, Relay 2 turns OFF.
Display Units
The pressure values can be displayed in the following units:
  1. Pascal (Pa)
  2. Millibar (mbar)
  3. Kilopascal (kPa)
  4. Meters of Water Column (mWC)
  5. Millimetres of Mercury (mmHg)

APPLICATIONS

Differential pressure transducers are widely used in:
  • HVAC systems – measuring air duct pressure,
  • Air filter monitoring – detecting filter blockage,
  • Clean room pressure control,
  • Airflow measurement,
  • Boiler and industrial process control,

CONCLUSION

The KATLAX Differential Pressure Transducer is a reliable device designed for accurate pressure difference measurement in HVAC and industrial environments. With features such as dual relay outputs, adjustable setpoints, multiple display units, and LCD display, the device provides flexible monitoring and control of pressure conditions. 
Its robust construction, IP65 protection, and wide measurement capability make it suitable for applications such as air duct pressure monitoring, filter blockage detection, clean room pressure control, and process automation systems.

Frequently Asked Questions (FAQs)

1. What is the purpose of relay outputs in a differential pressure transducer?
Relay outputs are used to control external devices or alarms when the measured pressure reaches predefined setpoints.

About the Author – Insight Control System

Insight Control System provides technical education and practical guidance in the fields of Building Automation Systems (BAS), HVAC controls, PLC programming, sensors, and industrial automation. The content published on this platform is based on field experience, technical documentation analysis, and real-world system applications.

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