HCM Series

The HCM Series provides a thermopile sensor chip and optical filter suited to the application plus an analog ASIC for signal conditioning inside a small SMD package. The gain of the ASIC can be preset to either 2150 or 4300 by an internal pull-up resistor. With the integrated linear temperature reference changing ambient temperature can be compensated for. The sensor supply voltage can be chosen in the range between 2.7 V and 5 V.

Features and Benefits

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Small leadless SMD package
Integrated ASIC with analog output
Integrated linear temperature reference
Large number of optical filter options
Large operating range -20°C to 120°C
Ideal for gas concentration measurements

Specifications

	HCM C12	HCM C2c2	HCM C22	HCM E222	Unit
Number of channels	1	1	1	2
Sensor footprint	3.8x3.8	3.8x3.8	3.8x3.8	5x5	mm²
Element size	0.61²	0.76²	1.2²	1.2²	mm²
Voltage response	22	30	63	63	V mm² / W
Sensitivity	58	52	44	44	V / W
Resistance R_TP	86	75	84	84	kOhm
TC of resistance R_TP	0.02	0.02	0.02	0.02	% / K
Noise	38	35	37	37	nV / Hz½
Detectivity	0.9e8	1.1e8	1.4e8	1.4e8	cm Hz½ / W
Time constant	<5	10	10	10	ms
Temperature reference voltage	1.4	1.4	1.4	1.4	V
Sensitivity temp. ref.	16	16	16	16	mV/°C
Zero input signal voltage	1.2	1.2	1.2	1.25	V
Sensor gain	4300 or 2150	4300 or 2150	4300 or 2150	4300 or 2150	V / V
Field of view	120	120	120	120	degree
Operating temperature	-20 .. 120	-20 .. 120	-20 .. 120	-20 .. 120	°C
Storage temperature	-40 .. 120	-40 .. 120	-40 .. 120	-40 .. 120	°C

Filter Options

Gas Concentration Measurements

Gas	CWL in nm	HPBW in nm	Filter
CH₄	3300	160	F3.3/160
HC	3375	190	F3.375/190
CO₂	4260	180	F4.26/180
CO₂	4300	110	F4.3/110
CO₂	4430	60	F4.43/60
CO	4640	180	F4.64/180
CO	4640	90	F4.64/90
N₂O	4530	85	F4.53/85
NO	5300	180	F5.3/180
- (ref.)	3910	90	F3.91/90