HK Instruments

• Operating on the Pitot tube principle
• Insensitive to airflow direction
• Accuracy: 2 %
• Pairs well with HK Instruments DPT-FLOW transducers
• Connection: 1/4” OD tubing
• Operating temperature: 5...95 °C
• Round or rectangular duct
• Various duct size options (up to 1200 mm)

• Air velocity measurement range: 0...2 / 0...10 / 0...20 m/s (selectable via jumper)
• Temperature measurement range: 0...50 °C
• Output: 0...10 V / 4...20 mA
• Option: LCD screen
• Option: relay output
• Supply: 24 VDC/VAC
• Operating temperature: 0...+50°C
• Protection class: IP54

• Maximal pressure measurement range: 0...7000 Pa
• Air flow and velocity measurement
• LCD screen
• Allowed overpressure: 25 kPa
• Supply: 9 V battery
• Operating temperature: 10...+50°C
• Protection class: IP54

• Maximal pressure measurement range: 0...1000/2000/5000/7000 Pa
• Air flow and velocity measurement
• Output: 0...10 V / 2...10 V or 4...20 mA
• Option: autozero function and LCD screen
• Allowed overpressure: 25 kPa
• Supply: 10...35 VDC
• Operating temperature: -40...+50°C (see datasheet)
• Protection class: IP54

Carbon dioxide (CO2) and temperature transmitter with a display CDT2000 Duct. The device is designed for measurement of air parameters in ventilation channels.

• CO₂ range 400...2000 ppm
• Temperature range 0...50 °C

Carbon dioxide (CO₂), temperature and humidity transmitter with a display CDT2000.

• Carbon dioxide (CO₂) range: 400...2000 ppm
• Humidity range: 0...100 % 
• Temperature range: 0...50 °C

Carbon dioxide transmitter CMT is designed for CO concentration measurement. The transmitter is used to control interior ventilation systems.

• CO range 0...300 ppm

The DPI series electronic pressure measuring devices are engineered for building automation in HVAC/R industry. The most technologically advanced and versatile electronic differential pressure switches on the market, combining up to two relay outputs and 0–10 V output options.

• Range: from 0....60 to 0...5 kPa
• Accuracy: ±2% (FS 20°C)
• Allowed overpressure: 20 kPa
• Operating temperature: -5...+60°C

Differential manometer DPG/PS for air and non-aggressive gasses, designed for pressure monitoring and control. Used in ventilation and conditioning systems for filter permeability control.

• Range: 0…1500 Pa
• Switch activation range: 20…1500 Pa
• Operating temperature: -5… +60°C

Differential manometer MM/PS for air and non-aggressive gasses, designed for pressure monitoring and control. Used in ventilation and conditioning systems for filter permeability control.

• Range: 0…1500 Pa
• Switch activation range: 40…1500 Pa
• Operating temperature: -20… +60°C

Differential pressure switch is designed for use in air and non-aggressive gasses. Made by HK Instruments (Finland).

• PID controller
• 2 set points (SP), chosen by binary input
• Pressure measurement range: -250...2500 Pa
• Output: 0...10 V
• Input: NTC10, NTC20, Pt1000, Ni1000
• LCD screen
• Temperature compensation
• Allowed overpressure: 25 kPa
• Supply: 24 VDC/VAC
• Operating temperature: -20...+50°C
• Protection class: IP54

• Maximal pressure measurement range: 0...2500 Pa
• 8 field selectable measurement ranges (via jumper)
• Output: 4...20 mA
• Option: LCD screen
• Allowed overpressure: 25 kPa
• Supply: 10...35 VDC
• Operating temperature: -10...+50°C
• Protection class: IP54

• Two pressure transmitters in one device
• Pressure measurement range: -250...2500 / -250...7000 Pa
• Option: DPT-DUAL-MOD-AHU – with air flow transmitter
• Output: Modbus RTU
• Allowed overpressure: 25 kPa
• Supply: 24 VDC/VAC
• Operating temperature: -20...+50°C
• Protection class: IP54

• Pressure measurement range: -250...2500 / -250...7000 Pa
• Input: 2 x  0...10 V, NTC10k, Pt1000, Ni1000, binary
• Output: Modbus RTU
• Temperature compensation in range of 0...50 °C
• Allowed overpressure: 25 kPa
• Supply: 24 VDC/VAC
• Operating temperature: -20...+50°C
• Protection class: IP54

Differential pressure transmitter with Modbus interface DPT-MOD-2000, DPT-MOD-3000 and DPT-MOD-5000 for usage in air and non-aggressive gasses.

Differential 8 range pressure transmitter DPT250, DPT2500 and DPT7000. Designed for usage in air and non-aggressive gasses.

• Pressure measurement range: from 0...1 bar to 0...6 bar
• Made to be used for air-conditioning, heating and water systems
• For neutral fluids and non-aggressive gases, compatible with refrigerants
• Output: 4...20 mA
• Supply: 24 VDC/VAC
• Operating temperature: -20...+80°C
• Protection class: IP65

• PID controller
• Pressure measurement range: 0...2500 Pa / 0...7000 Pa
• Switchable between air flow and pressure measurement
• Output: 0...10 V / 4...20 mA
• Option: autozero function
• Allowed overpressure: 25 kPa
• Supply: 24 VDC
• Operating temperature: -20...+50°C
• Protection class: IP54

• PID controller
• Pressure measurement range: 0...2500 Pa
• Modbus RTU communication
• Control output: 0...10 V
• External input: 0...10 V / thermistor / binary
• LCD display
• Temperature compensation
• Allowed overpressure: 25 kPa
• Supply: 24 VDC
• Operating temperature: -20...+50°C
• Protection class: IP54

• Temperature measurement range: 0...50 °C
• Humidity measurement range: 0...100 %
• Output: 2 x 0...10 V / 2...10 V / 4...20 mA
• Option: LCD display
• Option: relay output
• Option: Modbus RTU
• Supply: 24 VDC/VAC
• Operating temperature: 0...50 °C
• Protection class: IP20

• Temperature measurement range: 0...50 °C
• Humidity measurement range: 0...100 %
• Output: 2 x 0/2...5/10 VDC
• Option: LCD display
• Option: Modbus RTU
• Supply: 24 VDC/VAC
• Operating temperature: 0...50 °C
• Protection class: IP54

• Range: -250...2550 Pa
• Maximal overpressure: 30 kPa
• Accuracy: ±1,4 %
• Pressure and air flow measurements from air diffusers and valves
• Data can be uploaded on your computer for visualization and further analysis
• Over 700 programmed valve types
• Mediums: air and non-aggressive gases
• Operating temperature: -10... +50 °C
• Connection: ø 5 mm pressure hoses
• Can be used with Pitot tube
• 5 year warranty
• Included: calibration certificate, 2 x 2 m PVC hoses

SIRO is an indoor air quality transmitter with a modern design. The transmitter is available with several optional air quality sensors. The modular device can be equipped with CO2 concentration and VOC (Volatile Organic Compounds) measurements or alternatively PM (Particulate Matter) measurement, and in addition, temperature and humidity measurements. SIRO-MOD series models use Modbus serial communication protocol.

• Measuring elements:
  • CO2: Non-dispersive infrared (NDIR); 0...2000 ppm
  • VOC: Complementary Metal Oxide Semiconductor (CMOS); range: * - see datasheet
  • PM: Laser-based light scattering particle sensing
  • Temperature: Integrated to CMOS
  • Relative humidity: Thermoset polymer capacitive sensing element
• Field configurable outputs for selected measurements; Configuration possible through MODBUS
• Proportional output options including voltage (0–10 V, 0–5 V, 2–10 V) and optional current (4–20 mA); MODBUS
• Offset feature enabling field calibration for each measurement parameter (CO2, VOC, PM, RH, T)
• Optional LCD-display and buttons
• Operating temperature: 0…50 °C
• Protection standard: IP20

Traditional U-shaped with easily controlled zero point. For air and non-aggressive gasses.

• Range: -500...500 Pa

Fluid manometer for air and non-aggressive gasses – high quality pressure meter for narrow temperature ranges.

• Range: 0…10 kPa

Differential manometer MM for air and non-aggressive gasses, designed for pressure measurement in narrow ranges.

• Range: -100…1500 Pa
• Operating temperature: -40… +60°C