Specifications - HMT370EX

HMT370EX User Guide
Document code
M212305EN
Revision
B
Language
English
Product
HMT370EX
Document type
User guide
Table 1. Measurement performance
Property Description/value
Relative humidity
Measurement range 0 … 100 %RH

Accuracy at +23 °C (+73.4 °F) 1

 ±0.8 %RH (0 … 90 %RH)
Factory calibration uncertainty 2

±0.5 %RH (0 … 40 %RH)

±0.8 %RH (40 … 95 %RH)
T63 response time 15 s
Sensor options

HUMICAP® R2

HUMICAP® 180L2 3
Temperature
Measurement range −70 … +180 °C (−94 … +356 °F)

Accuracy at +23 °C (+73.4 °F) 1

±0.1 °C (±0.18 °F)
Factory calibration uncertainty 2 ±0.1 °C (±0.18 °F) at +23 °C (+73.4 °F)
Sensor Pt1000 RTD Class F0.1 IEC 60751
Other available measurement parameters
Dew point temperature, dew point / frost point temperature, absolute humidity, mixing ratio, wet-bulb temperature, water concentration, water vapor pressure, water vapor saturation pressure, enthalpy, dew point temperature difference, absolute humidity at NTP, water mass fraction, relative saturation, water activity, water concentration in mineral transformer oil, water concentration in JET A-1 fuel, saturation temperature 4
Figure 1. Humidity measurement accuracy as function of temperature

Humidity measurement accuracy specified for dew point temperature of max. 95 °C ( 203 °F).

Figure 2. Temperature measurement accuracy over full range

HUMICAP® 180L2 sensor option

The HUMICAP® 180L2 sensor is used in the HMP378F and HMP378H probe variants that are intended for oil and JET A-1 fuel measurements.

Table 2. HUMICAP® 180L2 measurement performance
Property Description/Value
Water activity
Measurement range 0 … 1 aw 5
T90 response time 6 10 min
Sensor HUMICAP® 180L2
Accuracy 7

±0.01 aw (±1 %RS)
Factory calibration uncertainty

±0.6 %RH (0 … 40 %RH)

±1.0 %RH (40 … 95 %RH)
Temperature
Measurement range −40 … +180 °C (−40 … +356 °F)
Accuracy at +20 °C (+68 °F) ±0.2 °C (0.36 °F)
Figure 3. Aw measurement accuracy
Table 3. HMP378F and HMP378H ppm accuracy
Property Value
JET A-1 fuel ppm accuracy (HMP378H) 8 ±15 % of the reading (typical)
Moisture in transformer oil ppm accuracy (HMP378F) 9 ±10 % of the reading (typical)
Table 4. Operating environment
Property Description/value
Operating temperature for electronics -40 … +60 °C (-40 … +140 °F)
Operating temperature with display -20 … +60 °C (-4 … +140 °F)
Storage temperature -40 … +70 °C (-40 … +158 °F)
Pressure range See probe specifications
Table 5. Compliance
Property Description/value

EMC compatibility

EN 61326‑1, industrial environment

Compliance marks

 CE, China RoHS, RCM
Table 6. Inputs and outputs
Property Description/value

Operating voltage

12 – 28 V
Analog outputs

2 outputs (two-wire, 4 – 20 mA)

Connection via safety barriers
Typical accuracy of analog outputs at +20 °C ±0.0625 % full scale
Typical temperature dependence of analog outputs 0.005 % / °C (0.005 % / °F) full scale
Transmitter service port connection USB cable 219690
Probe service port connection USB cable USB2
Display options
  • Graphical LCD display
  • Model without display (LED indicator)
Table 7. Mechanical specifications
Property Description/value
Connections Screw terminals, 0.33 … 2.0 mm2 wires (AWG 14-22)
Cable glands M20 x 1.5
Conduit fitting NPT 1/2" and M16
Housing material EN AW-6082
Housing weight

Transmitter with LCD display: 1500 g (3.3 lb)

Transmitter with LED indicator: 1520 g (3.35 lb)

HMP371 fixed probe: 320 g (0.7 lb)

IP rating

IP66: Dust-tight. Protected from powerful water jets from any direction.

NEMA rating

NEMA 4: Dust-tight. Protected from powerful water jets from any direction.
Figure 4. HMT370EX transmitter dimensions
1 Defined against calibration reference. Including non-linearity, hysteresis, and repeatability.
2 Defined as ±2 standard deviation limits. Small variations possible; see calibration certificate.
3 The HUMICAP® 180L2 sensor is used in the HMP378F and HMP378H probe variants that are intended for oil and JET A-1 fuel measurements. For specifications, see Table 2.
4 For units and abbreviations, see Available measurement parameters.
5 0 … 1 aw corresponds to 0 … 100 %RH
6 At +20 °C (+68 °F) in still oil.
7 In range 0 … 0.5 aw, including non-linearity, hysteresis, and repeatability. See accuracy graph below.
8 For more information on HMP378H measurements, see HMP378H probe option for measuring JET A-1 fuel moisture and temperature
9 Note: valid for mineral transformer oil. For more information on HMP378F measurements, see HMP378F probe option for measuring oil moisture and temperature