Ansi Engineers

HK Instruments Oy is a family‑owned Finnish company that designs and manufactures user‑friendly measuring and control devices for building automation, indoor air quality and HVAC systems. With over 30 years of experience, HK Instruments focuses on high‑accuracy, easy‑to‑install instruments that provide real‑time data for efficient building performance, energy savings and occupant comfort.

Their products are widely used in air handling units, ventilation systems, cleanrooms, commercial buildings, laboratories and residential environments — wherever monitoring of air pressure, flow, temperature, humidity or indoor gases is critical.

Key HK Instruments Product Categories 1. Differential Pressure Transmitters

HK Instruments offers accurate differential pressure transmitters — such as DPT‑R8, DPT‑Priima, DPT‑MOD, DPT‑Dual and DPT‑Dual‑MOD — that measure static and differential pressure in air ducts and rooms. Some models include Modbus communication and automatic zero calibration for low‑maintenance operation.

✔ Automatic zero point calibration
✔ Field‑selectable units & multiple ranges
✔ Outputs: 4–20 mA / voltage / Modbus

✔ Used for HVAC control, filter monitoring, pressure balancing, cleanroom monitoring and airflow control.

Pressure Transmitters for Liquids

PTL series pressure transmitters are designed for measuring pressure in liquids (e.g., water, heating/cooling systems) and are built to handle condensation and HVAC liquid environments. Typical variants include PTL‑Heat and PTL‑Cool with options for 0–10 V or 4–20 mA outputs.

✔ Two‑layer protection against condensation
✔ Suitable for refrigerants and non‑aggressive media
✔ 15–24 VDC/VAC power with analogue outputs.

3. Air Flow & Velocity Transmitters

HK Instruments also produces air flow and velocity measurement devices like DPT‑Flow, DPG, and FloXact™ probes — used to measure air quantities and duct velocities in ventilation systems. The FloXact probe features multi‑point averaging for enhanced accuracy at low speeds.

Indoor Air Quality & Gas Transmitters

These include:
• CO₂ (carbon dioxide) transmitters (e.g., CDT2000, CDT2000 Duct)
• Humidity & temperature transmitters (RHT series, RHT Duct)
• Carbon monoxide (CO) transmitters (CMT)
These units help monitor air quality, comfort, safety and energy efficiency in indoor environments.

5. Pressure & Air Gauges, Manometers

Analog and digital gauges such as MM series liquid column manometers, MMK vertical tube manometers and DPG pressure gauges provide simple, direct visual readings of air pressure or differentials in ducts and HVAC systems.

Passive & Temperature Sensors

HK Instruments supplies passive temperature sensors (e.g., room or outdoor sensors) that integrate with HVAC controllers, helping with temperature regulation, heating/cooling demand and energy optimization.

7. Pressure Switches & Controllers

They also manufacture pressure switches (DPI/PS) and pressure/flow controllers for automated controls and alert functions in ventilation and fluid systems.

8. Micromanometers & Accessories

Handheld micromanometers like PHM‑V1 help technicians measure and adjust diffuser airflow, valve positions and duct pressures — often used during HVAC balancing and commissioning.