User’s Guide www.vaisala.
Table of Contents First Startup.......................................................................................... 3 Initial Settings.............................................................................3 Product Overview .............................................................................. 4 The HM40 Meter - Front .................................................................. 5 The HM40 Meter – Back...................................................................
Backlight.................................................................................... 27 Battery ....................................................................................... 28 Navigation................................................................................. 28 Rounding ................................................................................... 28 Factory Settings ..................................................................... 29 How to Measure.....................
First Startup 1. Check that the HMP113 probe is securely attached and remove the yellow transport protection cap from the probe. 2. Open the battery cover and insert two AA-size batteries. 3. Close the battery cover and turn on the meter by pressing the Power button. If the meter does not turn on, check the battery orientation. Replace the batteries with fresh/recharged ones if needed.
Product Overview The Vaisala HUMICAP® Hand-Held Humidity and Temperature Meter HM40 is a hand-held meter for various portable measurement applications. Main features: - Compact and robust housing. - Measures a wide range of parameters: RH, Td, Tw, a, x, h, T. See section Parameters Explained on page 11. - Large graphical display. - Graphs for selected parameter and temperature. - Interchangeable HMP113 probe. - Available with standard probe or remote probe handle.
The HM40 Meter - Front Filter and sensor HMP113 probe Probe holder Display Left function Right function Up Down Menu Power 5
The HM40 Meter – Back Belt clip Battery cover Batteries 2 x AA 6
HM40 With Handle HMP113 probe Orientation mark Cable connector Probe holder HM40 handle 7
You can connect the HM40 handle to the belt clip for single handed use. Simply push the belt clip into the slot in the handle. When the handle is connected to the meter in this way, you can lay down the meter on top of the handle.
Batteries The HM40 is powered by two AA-size batteries. You can use the following battery types: - Alkaline (IEC-LR6) - Lithium (IEC-FR6) - NiMH (IEC-HR6) Do not mix batteries of different types. Both batteries must be of the same type. Observe instructions storage and operation instructions of the battery manufacturer. Alkaline batteries are the standard choice in nonrechargeable batteries. They are a good match for the power requirements of the HM40.
Charging The optional USB charger provides a convenient way to charge two NiMH batteries from any powered USB port (for example, from a laptop computer). 1. Place the rechargeable batteries in the charger and plug it into a USB port. The blue LED on top of the charger starts to blink. 2. When the LED stops blinking and stays on, the batteries are charged. The charging time is several hours for two fully discharged NiMH batteries.
Parameters Explained The table below describes the parameters measured by the HM40. All of the parameters are measured or calculated when the meter is on, independent of what is currently displayed. Parameter Symbol Unit(s) Description Relative humidity RH % Ratio of the partial pressure of water vapor in the air to the saturation vapor pressure of air at the current temperature. Dewpoint Td °C °F Temperature at which the water vapor in the air will condense into water at the current pressure.
Measurement Views Screen Layout and Controls Alert indicator Current quantity Battery indicator Measurement display area Current view Long press: tag point Change view Short press: tag point and hold screen Enter menu Change quantity Long press: power on/of Short press: activate backlight Pressing the right function button holds the screen and tags the current measurement point. See Hold and Tag on page 18.
Indicators Battery charge indicator Fresh batteries will always show three bars. When the indicator shows two bars, the voltage of the batteries has started to drop. When there is a single (blinking) bar left, you should replace the batteries. The meter will turn off automatically when the battery voltage drops too low. Alert indicator This indicator is shown next to the battery charge indicator if there is a measurement problem.
Numeric View The Numeric view shows the currently values of the selected humidity parameter and temperature. In the all parameters view the font is smaller to fit all values on screen.
Statistics View The Statistics view shows the current value of the selected parameter, as well as the maximum, average, and minimum value since the measurement was started. There is also a counter that shows how long the measurement has been running. The icons are: Maximum Average Minimum Measurement time The counter for measurement time is not shown in the all parameters view.
Graph View The Graph view shows a continuously updating graph of the selected parameter and temperature. The graph limits and spacing adjust dynamically to show the full range of measurements. HM40 has no permanent memory for graph data: when you turn the meter turned off, the graphs are cleared. Only tagged points are stored in permanent memory.
You can change the timescale of the graph in the Main menu. By default, the graph will automatically change the timescale to fit the measured data. If you select a short timescale, only the most recent data will be visible. The graph view is not available in the all parameters view. Select a single parameter to show the graph.
Hold and Tag If you press the right function button (Hold button) in a measurement view, two things happen: - The measurement view freezes until you press the Release button. - The latest measurement point is tagged (marked and stored in permanent memory). See section Tagged Points on page 21. Tagged points are shown in the graph view as small dots below the graphs. You can view the measurement values at the tagged points in the menu.
When the screen is held, the top of the display displays the current date and time. This is useful when you want to record the current data (take a photograph or write it down). If time has not been set, the top of the screen will simply read “HOLD”. When the view is held, you can reset all measurement data by pressing the Reset button. This will clear all graphs and tagged points. If you keep pressing the right function button (long press), the meter will tag the point without freezing the screen.
Main Menu You can open the menu from the measurement view at any time by pressing the menu button. If you are already in the menu, pressing the menu button returns you to the measurement view. If you are in a submenu, the menu button returns you to the previous menu level. Use the arrow buttons to move up and down in the menu, and function buttons to operate the menu options. Typical functions in the menus are: - View and Enter open the selected menu option or submenu.
Tagged Points Select Tagged points in the main menu to see the list of stored points and values. Time and temperature value are always shown for each tagged point. The humidity parameter that is shown is the same as you have selected in the measurement view. If all parameters view has been selected, RH is shown instead. The data stored for each tagged point includes: - Time when the point was tagged. - Serial number of the probe that was used (useful for identifying the point).
HM40 can store up to 40 tagged points. If a new tagged point is stored when the memory is full, the oldest tagged point is silently deleted to make room for the new point. Graph Duration In the Graph duration screen, you can select the timescale of the Graph view. The shortest selectable timescale is 1.5 minutes, the longest 32 hours. You can also select Autoscale, which means that the timescale will automatically adjust to show all of the measurement data in memory, up to the maximum of 32 h.
Calibration In the Calibration submenu, you can perform an adjustment procedure that corrects the humidity and temperature measurement of the meter. For more information and the adjustment procedure, see section Calibration on page 35. Help Opens a menu with help topics on measurement, calibration, and the measured parameters. The help menu also includes a device information screen where you can view technical information about your HM40 indicator and the HMP113 probe.
Settings Submenu Language In the Language screen, you can change the display language of the meter.
Units The Units setting determines the measurement system that is used for the parameters: metric or nonmetric. - Metric - Non-metric The Pressure unit is set separately: - hPa - bar - atm - PSI Time & Date In the Time & Date menu, you can set the current date and time, and their presentation formats. Both date and time have their own pre-set formatting options.
In the Date setup screen, you can set the current date: - Arrow buttons change the selected value - Left function button selects the next value (year, month, or day). - OK button stores the date and returns to the Settings menu. After setting the date, set the desired date format using the Formatting option in the Time & Date menu. In the Time setup screen, you can set the current time: - Arrow buttons change the selected value. - Left function button selects the next value (hours, minutes, or seconds).
Pressure In the Pressure setup screen, you can set the current ambient pressure. The pressure information is used when calculating certain humidity parameters, such as mixing ratio (symbol x). If the ambient pressure differs significantly from the default setting of 1.0132 bar (due to high altitude, for example), set the correct pressure value so that the HM40 meter can calculate the measurement correctly. Backlight Always on: Screen is always lit. This option will shorten the battery life significantly.
Battery Use the Battery setting to tell the meter what kind of batteries are installed. This will help to scale the battery indicator correctly.
Factory Settings The Factory settings option restores all settings to their default values. Probe calibration is not affected.
How to Measure Remove the Transport Protection Cap Remove the yellow transport protection cap from the probe when taking the meter into use. Measure in a Stable Environment If the measurement conditions are changing, you cannot get a reliable measurement result. Do not measure near heat sources, air conditioning, open doors, or windows. For best results, leave the meter on in the measurement area and come back to check it later.
Avoid Condensation and Rain If the humidity sensor element becomes wet, the meter cannot measure until the sensor is dry again. Avoid rain and conditions where condensation can form on the sensor. Do not replace the transport protection cap if the probe or the cap is wet, since it will prevent the probe from drying. Do not touch the sensor or blow on it to dry it out.
Maintenance Cleaning The HM40 can be cleaned by wiping it with a moist cloth. If the filter becomes contaminated, it is very likely to affect the humidity measurement since residue on the filter will retain some moisture. Dirty filters should be replaced. Do not use solvents to clean the HM40. Do not spray anything directly on the HM40, since that may deposit impurities on the sensor. Do not immerse the HM40 in liquid to clean it.
Changing the Filter 1. Turn the filter counterclockwise to open it. 2. Turn the filter until it can be removed. 3. Pull the filter out straight. Do not touch the sensors with the filter. 4. Install the new filter and tighten it.
Changing the Probe Changing the probe is tool-free and is done in the same way for the standard probe (attached to the meter itself) and when using the HM40 handle. 1. Press the power button to turn off the meter. 2. Turn the probe holder (the grey nut at the base of the probe) counter-clockwise to loosen the probe. 3. Pull the probe holder and probe together away from the connector. 4.
Calibration The humidity measurement accuracy of the HMP113 probe should be checked once a year. You can do this yourself using a humidity reference (for example, the Vaisala Humidity Calibrator HMK15), or send the probe to a Vaisala Service Center for calibration. See the back cover of this manual for contact information. If the calibration shows that the measurement accuracy is no longer within specification, the probe must be adjusted.
Calibrating the HM40 Using HMK15 The HMK15 Humidity calibrator allows you to produce known humidity environments using saturated salt solutions. Performing a good calibration takes some time and preparation. Read the HMK15 User’s Guide before performing your first calibration with the HMK15. 1. Press the Menu button and select the Calibration submenu. 2. Select the parameter to be calibrated at menu item [1] Quantity. You can calibrate Temperature (T) or Relative Humidity (RH) measurement.
3. Select the number of calibration points at menu item [2] Points. You can perform a 1-point or 2point calibration. For 2-point calibration, you need two reference environments. For example, LiCl and NaCl salt chambers provide 11% and 75% relative humidity references. 4. Remove the filter from the probe and place the probe in the first reference environment (first calibration point). Take care not to damage the sensors. Wait 20 – 40 minutes for the reading to stabilize. 5.
The correction to the measurement at point 1 is now shown in the text for menu item [3]. If you are only doing a 1-point calibration, skip to step 8. 6. Place the probe in the second reference environment (second calibration point). Wait 20 – 40 minutes for the reading to stabilize. 7. Select menu item [4] Point 2 and press the Set button. The meter now shows the currently measured value of the selected parameter. Set the reference value using the arrow buttons and press the OK button.
8. Select menu item [5] Note to edit the calibration info text that is stored in the probe. Edit the text using the select button and arrow keys. When done, select the OK character in the bottom right corner to save the changed text. To exit without saving, press the Cancel button. 9. Select menu item [6] Apply to save the calibration in the probe. Check the applied corrections in the confirmation screen and press the Apply button. To exit without applying the correction, press the Cancel button.
Accessories and Parts Description HMP113 probe for HM40 HM40 handle and cable Plastic nut for HMP113 attachment NiMH rechargeable batteries (4 pcs) External battery recharger with USB connection and 2 batteries Case for HM40 (indicator and probe) Plastic grid filter for HMP113 probe Plastic grid with membrane filter for HMP113 probe Belt clip (3 pcs) Battery cover (3 pcs) Order code See Vaisala order form “HM40” HM40HANDLE DRW238590SP 229247SP 229249SP 235849SP DRW236214SP 230727SP 227710SP 225688SP See t
Filters Vaisala offers two types of filters for the HMP113 probe: - Plastic grid filter is the standard choice. It provides the fastest response time, as air can flow freely around the sensors. - Plastic grid with membrane filter has a membrane under the plastic grid (0.2 µm pore size) for additional protection against contaminants. It slows down the response time of the probe. For instructions on how to replace the filter on the HMP113 probe, see section Changing the Filter on page 33.
Technical Data Performance Relative Humidity Measurement range Accuracy (including non-linearity, hysteresis, and repeatability) at 0 ... +40 °C (+32 ... +104 °F) at -10 ... 0 °C and +40 ... +60 °C (+14 ... +32 °F and +104 ... +140 °F) Factory calibration uncertainty at +20 °C (+68 °F) Humidity measurement response time (90%) with plastic grid filter Stability Humidity sensor Temperature Measurement range Accuracy over temperature range: at 0 ... +40 °C (+32 ... +104°F) at -10 ... 0 °C and +40 ...
Mechanical Weight (with alkaline batteries) With standard probe With handle Materials Meter body Probe holder Probe Filter Housing classification Mechanical drop endurance 230 g 330 g PC/ABS blend, acrylic display lens PC/ABS blend (grey) PC/ABS blend (white) PC (glass reinforced) IP54 0.4 m with probe attached 1.
Dimensions with Standard Probe 12 155 238 83 30 72 44 44
Dimensions with Handle 230 70 12 30 32 73.5 140 213 13.5 8.4 36.5 4.
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