HEIMANN SENSOR · TEMPERATURE SENSORS

Heimann HTS A Single Thermopile Sensor Series

Heimann Sensor HTS A TO-39 official product family example — Official Heimann Sensor photo: HTS A TO-39; pictured family example, not every exact order variant.

TO-package single-element thermopile detectors for NDIR and infrared temperature sensing.

Original manufacturer: Heimann Sensor.

Technology distinction: An IR emitter, filter or thermopile sensing element alone is not a calibrated complete CO₂ or gas detector. No Ex-proof finished-equipment certification is implied.

Original Manufacturer Portfolio

Heimann official product family details →

Exact chip package, optical filter, field of view and temperature range require the manufacturer’s current part-number datasheet.

HTS A thermopile optical integration

The HTS A single-element detector produces an IR-dependent signal; specify the TO package pinout, spectral filter, amplifier/readout and lens/cell geometry for the ordered device. Temperature drift and optical contamination influence an NDIR analyzer, so a calibrated end instrument needs suitable compensation and field maintenance. The listed HTS A is not by itself a complete CO₂ transmitter, and its photo is a family-level example.

HTS A: TO-39 thermopile model-by-model detector selection

Option / criterion	Original maker technical detail	Design implication
Detector elements	HTS A11 0.6²; A1c1 0.76²; A21 1.2²; A31 2.1² mm²	Heimann specification table lists four chip sizes, while introductory copy says three; confirm order-code availability.
Voltage-response coefficient	22 / 30 / 63 / 115 V·mm²/W respectively	These values refer to different active areas; not actual voltage at known CO₂ ppm.
Time constants	<5 / 8 / 10 / 18 ms	Detector thermal constants are not gas sample T90 or complete NDIR instrument response.
Sensitivity	58 / 52 / 44 / 26 V/W; noise 38 / 35 / 37 / 38 nV/√Hz	Calculate SNR at the chosen emitter power, optical filter, cell length and amplifier bandwidth.
Environment / optics	−20…+120°C operating; 70° nominal FOV; optional 100 kΩ thermistor	Choose spectral filter and temperature reference as an order-code dependent build.

Selection, integration and qualification

Heimann’s passive HTS A detector is a thermoelectric source of a small voltage. It requires separate amplifier/ADC, wavelength filter, emitters and gas calibration to become an NDIR analyzer. A TO-39 housing and stock photograph do not prove that every chip/filter variant is interchangeable.

Original manufacturer references: Heimann HTS A series official specifications.