Technical data

HMP75, HMP76, and HMP77 measurement

performance

Relative humidity

Measurement range

0 … 100 %RH

Accuracy: 1) 2)

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 x reading) %RH

At −40 … +180 °C (−40 … +356 °F)

±(1.5 + 0.015 x reading) %RH

Factory calibration uncertainty

(+20 °C / +68 °F)

±0.6 %RH (0 … 40 %RH)

±1.0 %RH (40 … 97 %RH)

Response time (90%) at +20 °C (+68 °F) in still air:

HMP75 (with standard plastic grid)

17 s

HMP76 (with standard sintered bronze

filter)

60 s

HMP77 (with standard plastic grid and

stainless steel netting)

50 s

Typical long-term stability

Better than 1 %RH / year

Temperature

HMP75 measurement range

−20 … +60 °C (−4 … +140 °F)

HMP76 measurement range

−50 … +120 °C (−58 … +248 °F)

HMP76 short time measurement range −50 … +180 °C (−58 … +356 °F)

HMP77 measurement range

−70 … +180 °C (−94 … +356 °F)

Accuracy at +20 °C (+68 °F)

±0.2 °C (±0.36 °F), see the graph

below

Output parameters

Dew point, frost point, absolute humidity, mixing ratio, wet bulb temperature,

water content, vapor pressure, saturation vapor pressure, enthalpy, water

activity

1)

Including non-linearity, hysteresis, and repeatability.

2) Defined as ±2 standard deviation limits.

°C

°C

0

0

-80

-60

-40

-20

20

40

60

80

100

120

140

160

180

-0.7

-0.6

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Temperature measurement accuracy over temperature

range

HMP75, HMP76, and HMP77 general

specifications

Humidity sensor

HUMICAPâ 180R

HUMICAPâ 180RC (chemical purge,

sensor preheat)

Temperature sensor

Pt100 RTD Class F0.1 IEC 60751

Operating temperature range for

electronics

−40 … +60 °C (−40 … +140 °F)

Standard sensor protection

HMP75

Plastic grid

HMP76

Sintered bronze filter

HMP77

Grid with SS netting

HMP75, HMP76, and HMP77 mechanical

specifications

IP rating

IP65 (NEMA 4)

Housing material

ABS/PC blend

Probe material

Stainless steel (AIS316L)

Probe cable length (between indicator

and probe handle)

1.9 m (6.2 ft)

Probe cable length of HMP77 (from

handle to the root of probe)

5.0 m (16 ft)

Probe diameter

12 mm (0.47 in)

Weight

HMP75

250 g (8.8 oz)

HMP76

350 g (12 oz)

HMP77

500 g (18 oz)

MI70 measurement indicator

Operating environment

Operating temperature

−10 ... +40 °C (+14 … +104 °F)

Operating humidity

0 ... 100 %RH, non-condensing

Storage temperature

−40 ... +70 °C (-40 ... +158 °F)

Inputs and outputs

Max. no of probes

2

PC interface

MI70 Link software with USB or serial

port cable

Analog output

0 ... 1 VDC

Power supply

Rechargeable NiMH battery pack with AC

adapter or 4 × AA size alkalines,

type IEC LR6

Output resolution

0.6 mV

Accuracy

0.2 % full scale

Temperature dependence

0.002 %/˚C (0.01 %/˚F) full scale

Minimum load resistor

10 kΩ to ground

Mechanical specifications

Housing classification

IP54

Housing materials

ABS/PC blend

Weight

400 g (14 oz)

Compatibility

EMC compliance

EN 61326-1, portable equipment

Other

Menu languages

English, Chinese, Spanish, Russian,

French, Japanese, German, Swedish,

Finnish

Display

• LCD with backlight

• Graphic trend display of any

parameter

• Character height up to 16 mm (0.63 in)

Alarm

Audible alarm function

Data logging capacity

2700 real time data points

Logging interval

1 s to 12 h

Logging duration

1 min ... memory full

Resolution

0.01 %RH, 0.01 °C/°F, 0.01 hPa, 0.01 aw,

10 ppm / 0.01 %CO2

MI70 battery operation time

Typical charging time

4 hours

Operation times

Continuous use

48 h typical at +20 ˚C (+68 °F)

Data logging use

Up to a month