HygroLog HL20 and HL21 version 1: User Guide
Contents
1. Rotronic AG IN E HL20 V1_12 Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Document title Page 10f17 HygroLog HL20 and HL21 Data Logger User Guide O 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 a Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Document title Page 20117 Table of contents We AU AAA A E RO 3 1 1 Central ius iia a eines 3 2 General MeSCIriptiOn sccsseecseeeeeeseeesseeeseeeeeseeeseaesesaeeseseeeeeeeeescaesaseeeenseaeeeeesesnaeseseeeenseaeeeas 4 2 1 Models ici an dae raaa i ada eiaa aV aaia aaaea iada Ka aia adaa aa aaa aada teed 4 2 2 Required accessories oniani ainia N aaia a aria aaa 4 2 3 Batterie Sisan aaa a 4 2 4 Realtime Clock viii ia 5 2 5 MEMO eenaa aa a a a a N ela debe davies 5 2 6 Function Kay conc a Naa e NE 5 2 7 Status indicator LED cuota AA a 5 2 8 Service and data CONNMECHOM cccecceceeeeeeneeceeeeecaeeeeaaeeeeeeeeeeeeecaaeeseaaeseeeeeseaeeesaeeseeesenneess 6 2 9 Optional displays cito add 6 2 10 Operating IMIS wdc aid ed eg 6 211 COntiQurable Settings sade weiter idad 6 2 12 Factory default Senga iria dd 8 219 o A 8 AAA see cece chtwas eaten A cee sa cee stcuctunacs snare escuseutcersucptetcactandestaageeate 9 3 1 Front panel with optional display cererea iinan2. e 10 60 C with the factory supplied alkaline batteries e 0 100 RH non condensing Models with display e 0 50 C with the factory supplied alkaline batteries e 0 100 RH non condensing 2 11 Configurable settings Configuration of the data logger by the user and access to its functions requires a PC with the ROTRONIC HW4 software version 2 4 0 or higher installed Service cable AC3006 is used to connect the service data connector to a USB port of the PC 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 oe Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 7of17 Document title Instructions regarding the configuration of the data logger and access to its functions are provided in the following manuals E M HW4v3 F2 018 E M HW4v3 Main 7 5 E M HW4v3 A2 001 2 11 1 Relative humidity symbol and temperature unit Both the symbol representing relative humidity and the temperature can be configured to suit local requirements 2 11 2 Calculated parameter HL20 the data logger can be set to compute one of the following psychrometric parameters o Dew point Dp o Frost point Fp Notes e When the optional display is configured to show the calculated parameter either the symbol Dp or the symbol Fp appear to the left of the numerical value depending on whether the dew point or frost point wa
3. IN E HL20 V1_12 bes Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 6of17 Document title 2 8 Service and data connector The service data connector mini USB type can be accessed after removing the back cover see Operation The connector gives access to the data logger UART digital interface Universal Asynchronous Receiver Transmitter Configuring the data logger or retrieving the recorded data requires cable AC3006 or equivalent One end of the cable plugs into the service data connector The other end plugs into the USB of a PC with the ROTRONIC HW4 software installed See Initial start up for the location of the service data connector 2 9 Optional display The optional LC display has a backlight which can be enabled or disabled when configuring the data logger o HL20D depending on the configuration of the logger the LC display shows relative humidity and temperature or the dew frost point and temperature The top line displays humidity RH or the dew frost point o HL21D the LC display shows temperature The LC display can be configured to show the measured or calculated values with either one or two decimals Note the LC display is automatically turned on when the data logger is connected to the USB port of a PC by means of cable AC3006 or equivalent 2 10 Operating limits Models without display
4. HW4 software version 3 Device Manager and Data Logging HL20 HL21 data logger E M HW4v3 A2 001 HW4 software version 3 Probe Adjustment function AirChip 3000 devices E M AC3000 CP AirChip 3000 Communication Protocol E M CalBasics Temperature and humidity calibration basics Instructions for using the ROTRONIC humidity standards E T HumiDefs Humidity Definitions Note All document file names have an extension corresponding to the document release number This extension is not shown in the above table 8 Document releases Doc Release Date Notes _10 Mar 5 2010 Original release _11 Jun 20 2010 Updated document to HW4 software v 3 _ 12 Mar 9 2011 Corrected typing error in document O 2010 2011 Rotronic AG IN E HL20 V1_12
5. insulator When there is no air movement surprising differences in temperature and humidity can noted over short distances Air movement at the probe generally results in measurements that are both faster and more accurate 4 Maintenance 4 1 Periodic calibration check Both the Pt 100 RTD temperature sensor and associated electronics are very stable and should not require any calibration after the initial factory adjustment Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1 RH per year For maximum accuracy calibration of the HL20 should be verified every 6 to 12 months Applications where the data logger is exposed to significant pollution may require more frequent verifications Note calibrating and adjusting the data logger typically require a humidity temperature generator or other specialized equipment that may not be available to all users 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 ab Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 140f17 Document title Procedure for adjusting the data logger with the ROTRONIC HW4 software e Use cable AC3006 to connect the service connector of the data logger to the USB port of a PC with the ROTRONIC HW4 software installed Note that the ROTRONIC USB driver must be installed on the PC as explained in the HW4 manual E M HW4v3 Ma
6. plugs into a USB port of the PC PC with the ROTRONIC HW4 software installed version 2 4 0 or higher 2 3 Batteries All models ship with three AA batteries which must be inserted first see battery replacement Note To conserve battery power models with the LC display are shipped with the Display Sleep function enabled and set to 1 minute see Software Functions When the function key has not been pressed for some time in this case 1 minute the display sleep function automatically turns the display off The display can be temporarily turned on at any time by pressing on the function key 2 3 1 Battery lifetime The battery lifetime depends on the manner in which the HL20 or HL21 is being used The following examples are based on the following assumptions e Fresh set of AA batteries 2900 mAh e Display backlight turned off if applicable e Log interval set to 30 minutes O 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 bi Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 5of17 Document title Battery lifetime in months Models w o LC display 20 Models with LC display display sleep function set to 1 minute 13 Models with LC display display sleep function disabled 5 2 4 Real time clock After inserting a fresh set of batteries for the first time the real time clock must be adjusted
7. 18 Setting the Real Time Clock required configuration step The real time clock of the data logger should be set to agree with the date and time of the HW4 PC Service and data connector mini USB type Use cable AC3006 to connect the data logger to a USB port of the HW4 PC Start HW4 and discover the data logger by selecting with the mouse the following command in the menu bar Devices and Groups gt Search for Master Devices gt USB Masters When the Data logger icon appears left click with the mouse on the sign located to the left of the icon This displays the functional modules available for the data logger Click on the Device Manager module For additional instructions see document E M HW4v3 F2 018 O 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 ab Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 120f17 Document title Other initial configuration steps Other initial configuration steps include the following Temperature measurement unit Log interval Recording mode start stop or loop For additional instructions see document E M HW4v3 F2 018 3 2 3 Optional display configuration To conserve battery power models with a display are shipped with the Display Sleep function enabled set to 1 minute and with the display backlight disabled When configured in this manner the data logge
8. Depends on log interval and other settings Examples based on a 30 minutes log interval Models w o LC display 20 months Models with LC display display sleep function set to 1 minute 13 months Battery life time Low battery indication Yes with HW4 software or with optional display Humidity measurement HL20 Sensor ROTRONIC Hygromer IN1 Measuring range 0 100 RH Measurement accuracy at 23 C 0 8 RH Repeatability 0 3 RH Long term stability lt 1 RH year Response time Typical 3 min depends on air flow 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 Document code Rotronic AG Bassersdorf Switzerland Unit User Guide Document title HygroLog HL20 and HL21 data logger Instruction Manual Document Type Page 150f17 Sensor Pt100 RTD IEC 751 1 3 class B Measuring range 10 60 C Measurement accuracy at 23 C 0 2 C Repeatability 0 05 C Long term stability lt 0 1 C year Response time Typical 10 min depends on air flow Psychrometric calculations Dew or frost point user configurable setting Start up time 1 9s typical Data refresh rate 1 7s typical Recorded parameter s HL20 relative humidity and temperature HL21 temperature Recording media Internal EEPROM non volatile not removable Recording capacity HL20 20 000 value pairs HL21 20 000
9. Log HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 130f17 Document title The ROTRONIC HWA software is required to view the measured or calculated data on a PC monitor Connect the data logger to the HW4 PC as explained under Initial Start up HW4 is also required to download and save the recorded data to disk For additional instructions see document E M HW4v3 F2 018 3 5 Practical advice for measuring temperature and humidity The most common source of error when measuring relative humidity is a difference between the temperature of the probe and the temperature of the environment At a humidity condition of 50 RH a temperature difference of 1 C 1 8 F typically results in an error of 3 RH on relative humidity When using the data logger it is good practice to allow for sufficient for temperature equilibration with the environment The larger the initial temperature difference between the probe and the environment to be measured the more time temperature equilibration requires This can be monitored with the optional display In extreme situations condensation may occur on the sensors when the data logger is colder than the environment As long as the humidity temperature limits of the humidity sensor are not exceeded condensation does not alter the calibration of the sensor However the sensor has to dry out before it can provide a valid measurement Non moving air is an excellent
10. The data logger has an internal real time clock that is used to associate a date and time stamp with each data record When data recording is either started or stopped using the ROTRONIC HW4 software the real time clock is automatically synchronized with the PC clock e Log file format data download to a PC with HW4 The recorded data can be saved as a file to a PC using either HW4 or another communications software When using HW4 the file can be either formatted as a text file extension TXT or as an encrypted binary file extension LOG The LOG file format can only be read with HW4 and complies with the FDA GAMP rules regarding electronic records and electronic signatures 3 Operation 3 1 Front panel with optional display Status indicator LED Function key O 2010 2011 Rotronic AG IN E HL20 V1_12 Rotronic AG IN E HL20 V1_12 Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Document title Page 10 of 17 The LC display has a backlight which can enabled or disabled as part of the data logger configuration When the backlight is enabled it turns on for a few seconds after pressing on the function key The upper line corresponds to relative humidity or dew frost point and the bottom line corresponds to temperature In the event of an alarm out of limit value the display shows the symbol to the right of the value and
11. aa nano nn nn cnnn aN AE nani 9 3 2 Initial Start Up 3 28 i 10 3 3 Recording and displaying data models without display ooooococcnnncccnonoccccnnnancccnnnancccnnn 12 3 4 Displaying and recording data models with display oooonocccnnonncccononoccccnononcccnnnanccnnnn 12 3 5 Practical advice for measuring temperature and humidity oooooonoccccnonoccconnnaccccnanancnnnnn 13 4 Maintenance saraaa ae eee eae eee ce eee eee cee a 13 4 1 Periodic calibration Check oooonnnccccccnnnnccinocococcnncnnncnnnnnnnncnnnnnnnnnnno non nnn cnn rra nan nnn nc n nnnm nnmnnn nenn 13 4 2 Firmware Update ctra a deere ba 14 S echnical data acia 14 5 1 Specifications iienaa aaa e aaa a a aa oa aaea Saaidi aS 14 5 2 Dew DOMT ACCULACY id 16 GE IACCOSSOMO Sidi A 16 T S pporting GAOCUMENUS e e a araara se eaae eae a SEa nta 17 8 Document releases ccseeccccsseeeceenseeeeeenseeeeeenseeeeeenseeeeeenseeeseensneeeeensueeeeenseeeeeenseeeeenseeeeenss 17 O 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 bes Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 30f17 Document title Applicability This manual is valid for instruments with firmware version 1 0x check using the ROTRONIC HW4 software Device Manager Examples 1 0a 1 0b Changes in the last character of the version number reflect minor changes in the i
12. in e Start HW4 on the PC and search for the data logger HW4 Main Menu Bar gt Devices and Groups gt Search for USB Masters e After finding the data logger with HW4 expand the device tree to see the data logger functions Select Probe Adjustment e For further instructions see HW4 manual E M HW4v3 A2 001 4 2 Firmware updates Firmware updates will be available on the ROTRONIC website for downloading Firmware files are given a name that shows both to which device the file applies and the version number of the firmware All firmware files have the extension HEX Procedure for updating the firmware e Use cable AC3006 to connect the service connector of the data logger to the USB port of a PC with the ROTRONIC HW4 software installed Note that the ROTRONIC USB driver must be installed on the PC as explained in the HW4 manual E M HW4v3 Main e Copy the firmware update file from the ROTRONIC website to the PC e Start HW4 software on the PC and search for the data logger HW4 Main Menu Bar gt Devices and Groups gt Search for USB Masters e After finding the data logger expand the device tree to see the data logger functions Select Device Manager In the Device Manager menu bar select Tools gt Firmware Update For instructions see document E M HW4v3 F2 018 5 Technical data 5 1 Specifications General HL20 HL21 Device type Humidity temperature data logger with internal sensor s Battery type 3 x AA 1 5 V alkaline
13. ith battery charge indicator and message bar Function key starts and stops data logging turns optional LC display on and off Status indicator LED flashes green when logging flashes red for out of limit values or a logger problem Humidity temperature calibration and adjustment e Simulator mode used to validate the data recording function Note Instructions for using the HW4 software are not included in this manual These instructions are shipped separately on the software CD ROM O 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 oe Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 4of17 Document title 2 General description 2 1 Models Basic models without display o HygroLog HL 20 relative humidity and temperature logger function key status indicator LED internal sensors protected by a slotted cover o HygroLog HL 21 temperature data logger function key status indicator LED internal Pt100 RTD Models with display o HygroLog HL 20D same as HL20 LC display with backlight message bar and battery charge indicator o HygroLog HL 21D same as HL21 LC display with backlight message bar and battery charge indicator 2 2 Required accessories The following accessories are required in order to be able to configure the logger and to download and view the recorded data Cable AC3006 or equivalent
14. lank after 1 5 10 or 20 minutes 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 Document code Rotronic AG Bassersdorf Switzerland Unit HygroLog HL20 and HL21 data logger User Guide Document title Instruction Manual Document Type Page 8of17 The data logger suspends the Display Sleep function whenever the function key is pressed The function is also suspended when the data logger is connected to the USB port of a PC by means of cable AC3006 2 12 Factory default settings Configurable Settings Factory default Unit system Metric except USA English Psychrometric calculation No calculation Display resolution 1 decimal Display Sleep function Enabled display automatically turns off after 1 minute Display backlight Off Displayed parameters RH and temperature or temperature only Communication protocol RO ASCII Device name Instrument model Functions Factory default Humidity temperature adjustment Enabled Device write protection Disabled Limit humidity to 100 RH Enabled Out of limit value alarm Disabled Data recording Stopped loop mode 10 min interval Major sensor failure alarm Enabled cannot be disabled Simulator mode Disabled 2 13 Data logging e Function overview The main characteristics of the data logging function are as follows Re
15. lative humidity values are recorded with a resolution of 0 1 RH Temperature values are recorded with a resolution of 0 05 C 0 09 F Memory capacity 20 000 single values or value pairs Adjustable log interval from 5 seconds to 1 hour in increments of 5 seconds Two data recording modes Loop and Start Stop Note Any recorded data present in the data logger memory is automatically erased whenever a new recording session is started 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 Rotronic AG Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Document title Page 9 of 17 e Data recording modes Loop when the memory is full the logger dumps the oldest data sample and keeps recording The memory retains the most recent data Start Stop the logger stops recording data as soon as the memory is full Data recording can be stopped at any time by pressing on the function key long key press or with the ROTRONIC HWA software e Recorded parameters Depending on the model the data logger records either temperature only or relative humidity and temperature A calculated value such as dew point cannot be recorded by the HL20 but it can be added to the humidity and temperature data after downloading the recorded data to a PC with the HW4 software See the following HW4 manual E M HW4v3 F2 018 e Date and time
16. lay Operating limits 0 100 RH non condensing Critical environments Humidity sensor as per DV04 14 0803 02 Critical chemicals 5 2 Dew point accuracy The HL20 can be configured to calculate either the dew point or frost point based on the measurement of relative humidity and temperature The accuracy of this conversion varies depending on the humidity and temperature conditions as shown in the graph below DPIFP Accucary Seneorime 22 DP FP C 50 40 30 20 10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Temperature C Example at a temperature of 20 C a dew point value of 37 C is measured with an accuracy of 1 0 C or better 6 Accessories For accessories and parts such as the HW4 configuration software service cables calibration accessories and spare dust filters please see document E M HC2 accessories O 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 Document code Rotronic AG Bassersdorf Switzerland Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document title Document Type Page 170f17 7 Supporting documents Document File Name Contents E M HC2 accessories Accessories and parts for probes indicators and transmitters E M HW4v3 DIR List of the HW4 manuals E M HW4v3 Main HW4 software version 3 General instructions and functions common to all devices E M HW4v3 F2 018
17. nternal software of the instrument that do not affect the manner in which the instrument should be operated 1 Overview 1 1 General The HygroLog HL20 data logger can record up to 20 000 pairs of relative humidity and temperature values within the range of 0 to 100 RH and 10 to 60 C 14 to 140 F The HygroLog HL21 data logger can record up to 20 000 temperature values within the range of 10 to 60 C 14 to 140F Models with the optional LC display are limited 0 to 50 C 32 to 122 F Temperature is measured with a Pt100 RTD Relative humidity is measured with a ROTRONIC Hygromer IN1 capacitive sensor Both sensors are internal and there is no apparent probe Both the HL20 and HL21 require three AA batteries 1 5V for power Depending on both the log interval and the display option these data loggers can record data over a time period of up to 20 months without replacing the batteries Configuration of the HL20 and HL21 as well as the downloading and viewing of recorded data requires a PC with the ROTRONIC HW4 software installed as well as a service cable such as the AC3006 Based on the ROTRONIC AirChip 3000 digital technology the HL20 and HL21 offer the following features Unit system metric or English Real time clock runs for up to 4 hours without the 3 AA batteries after initial charge Calculation of the dew or frost point calculated parameter can be displayed but not recorded Optional LC display RH temperature w
18. prior to using the HL20 or HL21 see Operation The real time clock is powered from a large capacitor and can run for up to 4 hours without the batteries Removing the battery for an extended period of time will cause the logger to completely lose track of the date and time Because of the requirement to always keep track of the date and time the HL20 and HL21 do not have a power on off switch 2 5 Memory All models use a non volatile EEPROM internal memory to hold the measurement data The memory cannot be removed from the data logger Memory capacity is as follows HL20 20 000 pairs of relative humidity and temperature values HL21 20 000 temperature values 2 6 Function key The function key is used as follows e Long key press press the key for a few seconds to start or stop data logging e Short key press depending on the configuration settings of the display display sleep function a short key press turns on and off the optional LC display For more details see Operation 2 7 Status indicator LED The status indicator consists of a green and red LED The green side of the LED flashes every 5 seconds when logging is active The red side of the LED flashes every 5 seconds when a measured value is out of limits see Configurable settings or when the logger requires attention low battery memory full major sensor failure such as open or shorted sensor O 2010 2011 Rotronic AG IN E HL20 V1_12
19. r can record data for extended periods of time For additional instructions regarding the configuration of the display see document E M HW4v3 F2 018 3 3 Recording and displaying data models without display To start or stop recording data press on the function key for a few seconds When the Y data logger is recording data the status indicator flashes green every 5 seconds The ROTRONIC HWA software is required to view the measured or calculated data on a PC monitor Connect the data logger to the HW4 PC as explained under Initial Start up HW4 is also required to download and save the recorded data to disk For additional instructions see document E M HW4v3 F2 018 3 4 Displaying and recording data models with display Displaying data When the display sleep function is enabled the display goes blank after some time in order to conserve battery power display sleep function is not enabled the display can be manually turned off by pressing briefly on the function key Y To view the measured or calculated data press briefly on the function key When the Start or stop recording data logger is recording data this is indicated by the display message bar and by the LED To start or stop recording data press on this key for a few seconds When the data Y indicator flashes green every 5 seconds O 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 bes Bassersdorf Switzerland Document code Unit Hygro
20. s selected For values below freezing the symbol Fp indicates that the value is a frost point above ice as opposed to being a dew point above liquid e The data logger cannot be used to record either the dew point or the frost point 2 11 3 Alarm function out of limit value The alarm function can be enabled or disabled for each of the measured or calculated parameters High and low value can be associated with each parameter so as to define out of limits values A hysteresis value can also be entered for each parameter The hysteresis value is used for both the low and the high alarm conditions The data logger has a red LED which flashes when the value of any parameter is out of limits The LED stops flashing when the value returns to normal Log files do not record the existence of an alarm condition However when the contents of a log file are viewed as a data table with the HW4 software values that correspond to an alarm condition are printed over a red background based on the alarm settings that HW4 downloaded from the logger 2 11 4 Display Sleep function Using the Display Sleep function can substantially extend the lifetime of the battery When the Display Sleep function is active the LC display of the data logger stays blank The optional display of the data logger can be set to be always on In this case the display can be turned on and off manually with the function key The display can also be set to automatically go b
21. the LED indicator flashes red In addition to the measured values the display also provides information such as battery charge and data logger status 3 segment battery charge indicator For configuration instructions see the following HW4 manual E M HW4v3 F2 018 3 2 Initial start up 3 2 1 Battery compartment The battery compartment is located on the back panel and can be opened after loosening the screw that holds the cover in place Cover screw 2010 2011 Rotronic AG IN E HL20 V1_12 IN E HL20 V1_12 dci Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Page 110f17 Document title Insert three fresh AA alkaline batteries in the battery compartment Be sure to observe the polarity 3 2 2 Initial configuration all models Required Hardware and software e PC with the ROTRONIC HW4 software installed version 2 4 0 or higher e Cable AC3006 or equivalent connects the data logger service data connector to a PC USB port IMPORTANT After installing the HW4 software and prior to running HW4 connect cable AC3006 to a USB port of the PC The PC will detect the cable and ask for the appropriate driver The ROTRONIC USB driver ftdibus inf is located in a folder named USB_Driver which is in the HW4 installation folder For detailed instructions see documents E M HW4v3 Main 7 3 USB port and E M HW4v3 F2 0
22. values Real time clock Yes adjustable via PC Logging modes Start stop recording stops when memory is full Loop oldest data is dumped to make room for latest data Log interval Min 5 sec up to1 hour in 5 sec increments Interface for data download Internal connector located under protective cover Interface type UART Universal Asynchronous Receiver Transmitter Maximum service cable length 5 m 16 4 ft Optional display LC 1 or 2 decimals resolution backlight alarm and low battery indication LED indicator 5 sec green flash when recording data 5 sec red flash for out of limit value or logger problem Housing material ABS Housing protection grade HL20 IP 40 HL21 IP65 Overall dimensions 130 x 72 x 32 mm 5 1 x 2 8 x 1 3 Weight About 210 g 7 4 oz CE EMC immunity EMC Directive 2004 108 EG EN 61000 6 1 2007 EN 61000 6 2 2005 EN 61000 6 3 2007 EN 61000 6 4 2007 Solder type Lead free RoHS directive FDA GAMP directives compatible 2010 2011 Rotronic AG IN E HL20 V1_12 Rotronic AG IN E HL20 V1_12 Bassersdorf Switzerland Document code Unit HygroLog HL20 and HL21 data logger Instruction Manual User Guide Document Type Document title Page 16 of 17 _ Environmental limits HL20 HL21 10 60 C models w o display 0 50 C models with disp
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