We use cookies to make your experience better. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. Learn more.
The Vaisala HM40 is the functional replacement for the popular HM34 and HMI41. It features better accuracy, a large display and reading stabilization indication at a similar price level. A variety of probe options are available for most applications.
Vaisala HM40 HUMICAP® Hand-Held Humidity and Temperature Meter is compact, robust and affordable. It is a perfect spot-checking tool that is easy to use and provides reliable measurements. It can be used for different portable measurement applications. Basic and simple to utilize, the HM40 includes a user-friendly, large graphic display and easy-to-use push button interface. The multilingual user interface with 10 different languages, is simple and intuitive to use. Additionally numerous different settings can be programmed by the user to best suit their individual requirements. In addition to relative humidity and temperature, the HM40 provides 5 calculated humidity quantities.
The HM40 is easy to use, robust and provides a repeatable humidity measurements. The stabilization graph clearly indicates when the readings have stabilized. All readings are available in both metric and non-metric units, much improved over the outdated HM34 series. The meter is powered by 2 AA-sized batteries. An external NiMH battery recharger with USB connection and rechargeable NiMH batteries are available as options. Each HM40 comes also with a handy belt clip. The HM40 is available with an optional calibration certificate.
 |  |
See Data Sheet for detailed Specifications
Performance
RELATIVE HUMIDITY | |
| Measurement range | 0 ... 100 %RH |
Accuracy (including non-linearity, hysteresis, and repeatability) for different models at 0 … +40 °C |
±1.5 %RH (0 ... 90 %RH) |
(+32 … +104 °F) | ±2.5 %RH (90 ... 100 %RH) |
| Factory calibration uncertainty at +20 °C (+68 °F) | ±1.5 %RH |
Humidity measurement response time | |
| (90 %) with plastic grid filter (HM41 and HM45) | 17 s |
| (90 %) with membrane filter and steel grid (HM42) | 26 s |
| (90 %) with brass sintered filter (HM46) | 40 s |
| Stability | ±2 %RH over 2 years |
Humidity sensor | |
| HM41, HM45, HM46 | HUMICAP® 180R |
| HM42 | HUMICAP® 100R-Mini |
TEMPERATURE | |
Measurement range | |
| HM41 | -10 ... +60 °C (+14 ... +140 °F) |
| HM42 | -40 ... +100 °C (-40 ... +212 °F) |
| HM45 | -40 ... +60 °C (-40 ... +140 °F) |
HM46
| -40 ... +100 °C (-40 ... +212 °F), short-term up to +180 °C (+356 °F) |
Accuracy over temperature range: | |
| at 0 ... +40 °C (+32 ... +104 °F) | ±0.2 °C (0.36 °F) |
at -40 ... 0 °C and +40 ... +100 °C | |
| (-40 ... +32 °F and +104 ... +212 °F) | ±0.4 °C (0.72 °F) |
Temperature sensor | |
| HM41, HM45, HM46 | Pt1000 RTD Class F0.1 IEC 60751 |
| HM42 | Pt1000 RTD Class F0.3 IEC60751 |
Mechanics
Weight (with alkaline batteries) | |
| HM41 | 230 g |
| HM42 | 370 g |
| HM45 | 330 g |
| HM46 | 490 g |
Probe cable lengths | |
| HM42, HM46 | 1500 mm |
| HM45 | 1200 mm |
| Materials | |
| Meter body | PC/ABS blend, acrylic display lens |
| Probe holder | PC/ABS blend (gray) |
Probe handle
| PC/ABS blend (white), PC/ABS blend (gray, HM45) or PBT (gray, HM42/46) |
HMP113 probe or probe measurement head | PC/ABS blend (white, HM41/45) or stainless steel (HM42/46) |
Filter |
|
| HM41, HM45 | PC (glass-reinforced) |
| HM42 | Stainless steel and PTFE membrane |
| HM46 | Sintered brass |
| Housing classification | IP54 |
| HM42 and HM46 probes | IP40 |
General
| Power-up time | < 3 s |
| Batteries | 2 × AA, 1.5 V |
Calculated parameters
| Dew point, wet bulb temperature, absolute humidity, mixing ratio, enthalpy |
Menu languages
| English, Chinese (simplified), Finnish, French, German, Japanese, Portuguese, Russian, Spanish, Swedish |
| Display | LCD (140 x 160 pixels) |
| Operation time (typical) | 100 hours (without backlight) |
Operation temperature range | |
| indicator | -10 ... +60 °C (+14 ... +140 °F) |
| probe handle | -40 ... +60 °C (-40 ... +140 °F) |
probe head
| (see specifications for each probe type, ranges -40 …+180 °C (-40 … +356 °F) |
| Storage temperature range | -30 ... +70 °C (-22 ... +158 °F) |
Electromagnetic compatibility
| Complies with EMC standard EN61326-1, Portable Equipment |
Write Your Own Review