UEi DTH31 Digital Psychrometer Manual
Contents
1. functions C F Td WBT MIN MAX e Cancel hold by pressing RESET e D HOLD non sleep mode default setting is auto sleep in 5 minutes 3 AT DP Switch between AT DP and T1 11 AT T1 12 T1 Air Temp DTH3 1 MAN 4 AT WB Switch between AT WB and T2 T2 AT T2 DP T2 External Temp 5 C F Centigrade Fahrenheit Toggles between these two standard scales 6 MN MX RESET e Reset MIN MAX memory e Display minimum value of memory e Display maximum value of memory LCD Display O1 External Probe Port RH Air Temperature T1 T1 T2 Dew Point External Temperature T2 T2 DP Wet Bulb Not available without external probe connected Operating Instructions Fig 1 AN varna Be sure to open the sensor protection cap before taking measurements Auto Power Off Sleep Function Unit will turn itself off after ten 10 minutes of non use factory programmed The auto power off delay offers 2 5 10 20 40 and 60 minute options To change auto power off 1 Press D HOLD buttons 2 When 4 appears in the LCD release HOLD button Unit is now in non sleep mode Mode Options 1 Turn the protective cap to the open position Fig 1 2 Press D button to turn the unit on 3 Press C F button for 1 second to convert readings to desired unit Temperature relative humidity and wet bulb measurement will be displayed si2. adings 3 Press reser button until MIN or MAX disappear from display to return to current readings 11 MNMX 11 4 Press keser Dutton for more than 2 seconds to clear current reading from memory COO COs Ja ENN Rg 2 ofS 280 Fig 6 Fig 7 NOTE While checking MIN MAX value for T2 AT ADP don t replace the probe or the error code will display The error code will also appear if the probe s not installed when checking MIN MAX values AT DP and ADP WB TI T2 AT is calculated by subtracting the T2 Ex temp from T1 Air temp ADP is calculated by subtracting the DP dew point from T2 Ex temp u DP 1 Press 7 button until AT appears in display Fig 8 u amp DOP WE 1 2 Press 2 button until ADP appears in display Fig 9 lt Las Ll Lay WA I Ze DP aj s ii Fig 8 Fig 9 O80 COD Low Battery A battery symbol will display in the upper right corner when the battery is low Inaccurate readings will result from low batteries Fig 10 1 Open the battery cover on the back of instrument 2 Remove the expired batteries 3 Insert two new AAA V batteries DTH3 1 MAN WEN i 88 098 Fig 10 Troubleshooting If See This Should Check Malfunction Make sure the time of pressing 7 ON OFF key is more No display than 0 1 sec Check that the batteries are inserted correctly Replace bat
3. lE lla JC O MIN JL na Seems eb aj GI Gu m Sa Gu Ie q E 7 Cc 00 we BA DIGITAL PSYCHROMETER 1 800 547 5740 Fax 503 643 6322 www ueitest com email info Q ueitest com Introduction The DTH31 Digital Psychrometer is an advanced handheld humidity and temperature meter Its triple display shows three parameter readings simultaneously and includes a second temperature probe for external measurements It has everything you need to charge an air conditioning system and determine heating cooling and ventilation needs It gives you incredible fast and accurate wet bulb dry bulb and dew point measurements Nothing compares to this fully featured hand size digital psychrometer Features include e Triple display RH dry bulb and wet bulb temp e C F selectable e Turnable cap to protect sensor e 12 Air temp and T2 Dew Point e Data hold e MIN MAX e Automatic power off Safety Notes Before using this instrument read all safety information carefully In this manual the word WARNING is used to indicate conditions or actions that may pose physical hazards to the user The word CAUTION is used to indicate conditions or actions that may damage this instrument Controls and Indicators Buttons 1 ON OFF D Turns unit on and off 2 Hold Data Hold Freezes data input e HLD appears in upper right corner of display e View frozen data for any of these
4. mplied warranties of merchantability and fitness for a particular purpose are limited to the express warranty UEi shall not be liable for loss of use of the instrument or other incidental or consequential damages expenses or economic loss or for any claim or claims for such damage expenses or economic loss A purchase receipt or other proof of original purchase date will be required before warranty repairs will be rendered Instruments out of warranty will be repaired when repairable for a service charge Return the unit postage paid and insured to 1 800 547 5740 FAX 503 643 6322 www ueitest com Email info ueitest com This warranty gives you specific legal rights You may also have other rights which vary from State to state Copyright 2007 UFi DTH31 MAN 1 07
5. multaneously Fig 2 h a h a u b DTH3 1 MAN Data Hold Function 1 Press HOLD button until HLD appears in display e The current reading is now held and will not change until the HOLD function is cancelled Fig 3 2 Press HOLD button again to cancel e Hold function can be used for humidity dew point dry bulb T1 Ext Temp T2 wet bulb and temp differential COG _ E E li O08 wo c0 Fig 3 Dew Point Function 1 Press 79 button until DP appears in the display Select dew point T1 or delta T value in any mode while internal temperature is active Fig 4 Fig 4 Wet Bulb Function ADP WA 1 Press button until Wb appears in the display Fig 4 NOTE WB s always visible without external probe External Temperature Function 1 Plug the external probe into the meter SDP wa 2 Press 5 button until T2 appears in the display Fig 5 Unit will now display external probe temperature NOTE If the external probe isn t plugged into the meter T2 will not appear on display or any delta temperature Fig 5 MIN MAX Function 1 Press Reser button until MIN appears in display Fig 6 Display is now showing minimum humidity and temperature reading u MNMX 1 2 Press Reser button again until MAX appears in display Fig 7 Display is now showing maximum recorded humidity and temperature re
6. teries if needed Confirm battery indicator is displayed before display disappears If yes replace with new battery Check if sleep mode is active If yes press HOLD button to disable auto power off function Er 1 Circuit error in RH measurement Return instrument to UEi for repair see warranty Circuit error measuring internal temperature Return instrument to UEi for repair see warranty Er 3 Circuit error in self calibration channel Return instrument to o e I U Note Dry bulb temperature is air internal temperature Dew point and wet bulb are calculated from internal temperature and humidity Specifications Temperature Accuracy General Standard amp Optional Accessories Optional External temperature probe 0 00 cece eens ATT31 UL DTH31 Digital Psychrometer Limited Warranty The DTH31 is warranted to be free from defects in materials and workmanship for a period of one year from the date of purchase If within the warranty period your instrument should become inoperative from such defects the unit will be repaired or replaced at UEI s option This warranty covers normal use and does not cover damage which occurs in shipment or failure which results from alteration tampering accident misuse abuse neglect or improper maintenance Batteries and consequential damage resulting from failed batteries are not covered by warranty Any implied warranties including but not limited to i
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