HMP155 specifications - HMP155

HMP155 User Guide

Document code: M210912EN
Revision: G.1
Language: English
Product: HMP155
Document type: User guide

Table 1. Humidity measurement performance
Property	Description/value
Sensor	HUMICAP®R2, 180R and INTERCAP for typical applications HUMICAP®R2C, 180RC and INTERCAPC for applications with chemical purge and/or warmed probe
Observation range	0 … 100 %RH
Response time at +20 °C (+68 °F) in still air with sintered Teflon filter	63 %: 20 s 90 %: 60 s
Factory calibration uncertainty at +20 °C (+68 °F)¹	±0.6 %RH (0 … 40 %RH) ±1.0 %RH (40 … 95 %RH)
Accuracy (including non-linearity, hysteresis, and repeatability)
At +15 … +25 °C (+59 … +77 °F)	±1 %RH (0 … 90 %RH) ±1.7 %RH (90 … 100 %RH)
At −20 … +40 °C (−4 … +104 °F)	±(1.0 + 0.008 × reading) %RH
At −40 … −20 °C (−40 … −4 °F)	±(1.2 + 0.012 × reading) %RH
At +40 … +60 °C (+104 … +140 °F)	±(1.2 + 0.012 × reading) %RH
At −60 … −40 °C (−76 … −40 °F)	±(1.4 + 0.032 × reading) %RH

Table 2. Temperature measurement performance
Description	Value
Sensor	Pt100 RTD element, Class F 0.1 IEC 60751
Observation range	−80 … +60 °C (−112 … +140 °F)
Response time for additional temperature probe in 3 m/s (7 mph) air flow	63 %: < 20 s 90 %: < 35 s
Accuracy with voltage output
At −80 … +20 °C (−112 … +68 °F)	±(0.226 - 0.0028 × temperature) °C
At +20 … +60 °C (+68 … +140 °F)	±(0.055 + 0.0057 × temperature) °C
Accuracy with passive (resistive) output
According to Tolerance Class AA IEC 60751²	±(0.1 + 0.0017 × \|temperature\|) °C
Accuracy with RS‑485 output
At −80 … +20 °C (−112 … +68 °F)	±(0.176 - 0.0028 × temperature) °C
At +20 … +60 °C (+68 … +140 °F)	±(0.07 + 0.0025 × temperature) °C

Figure 1. HMP155 accuracy over temperature range: voltage and RS-485

Table 3. Dew point calculation specifications
Property	Description/value
Accuracy at −20 … +40 °C (−4 … +104 °F)	±0.6 at 90 … 100 %RH

Table 4. Quantities measured by HMP155
Quantity	Abbreviation	Metric unit	Imperial unit
Relative humidity	RH	%RH	%RH
Temperature	T	°C	°F
Additional T‑probe temperature	Ta	°C	°F

The calculated quantities are not available in the passive output version.

Table 5. Quantities calculated from measured quantities
Quantity	Abbreviation	Metric unit	Imperial unit
Dew point / Frost point temperature (Td/f)	TDF	°C	°F
Dew point temperature (Td)	TD	°C	°F
Mixing ratio (x)	X	g/kg	gr/lb
Wet bulb temperature (Tw)	TW	°C	°F

Table 6. Operating environment
Property	Description/value
Operating temperature for humidity measurement	−80 … +60 °C (−112 … +140 °F)
Storage temperature	−80 … +60 °C (−112 … +140 °F)
Operating humidity	0 … 100 %RH
IP rating	IP66: Dust-tight. Protected from powerful water jets from any direction.

Table 7. Inputs and outputs
Property	Description/value
Operating voltage	7 … 28 V DC
Minimum operating voltage	0 … 1 V output or RS‑485: 7 V 0 … 5 V output, or warmed probe: 12 V 0 … 10 V output, chemical purge, or XHEAT: 16 V
Outputs	Voltage output: 0 … 1 V, 0 … 5 V, 0 … 10 V Resistive Pt100 4‑wire connection RS‑485
Average power consumption (+15 V DC, load 100 kΩ)	0 … 1 V output: < 3 mA 0 … 10 V output: +0.5 mA RS-485: < 4 mA During chemical purge: Maximum 110 mA With warmed probe: Maximum 150 mA
Settling time at startup	Voltage output: 2 s RS-485: 3 s

Table 8. Mechanical specifications
Property	Description/value
Dimensions (H × W)	279 × 40 mm (10.9 × 1.6 in)
Weight	93 g (3.25 oz)
Materials
Filter	Sintered Teflon or membrane
Housing	Polycarbonate (PC)
Additional temperature probe	Stainless steel AISI 316L

Table 9. Compliance
Property	Description/value
EU directives and regulations	EMC Directive (2014/30/EU) RoHS Directive (2011/65/EU) amended by 2015/863
EMC compatibility	EN 61326‑1, Electrical equipment for measurement, control and laboratory use - EMC requirements; industrial environment CISPR 32 / EN 55032, Class B
RoHS	EN IEC 63000:2018

¹ Defined as ±2 standard deviation limits. Small variations possible (see also the calibration certificate).

² Tolerance Class AA IEC 60751 corresponds to IEC 751 1/3 Class B