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Page 40

Wahl DHS520

User Manual

12.0 MAINTENANCE

The

Wahl DHS520/520B

thermometer has been designed specifically to require

very little maintenance. There are several processes that are recommended
to help ensure that the instrument remains serviceable.

•

Ensure that the lens cover is fitted when the thermometer is not in use.

•

Ensure that the lens assembly, eyepiece and display panel are kept

clean and free from contaminants. On a regular basis, clean these
components carefully with a soft lens cloth and proprietary lens cleaner.

•

Check the thermometer for damage regularly. Pay particular attention

to the lens assembly, eyepiece, display panel, trigger and on/off switch.

•

Ensure that a spare, fully charged battery is kept with the thermometer

at all times.

In the unlikely event of an instrument fault,

do not

attempt to investigate or

repair the fault on-site. Contact Palmer Wahl to arrange a repair.

Содержание Heat Spy DHS520

Страница 1: ...0 520B Portable Infrared Thermometer User Manual Palmer Wahl Inc 234 Old Weaverville Road Asheville North Carolina 28804 Telephone 828 658 3131 Fax 828 658 0728 info palmerwahl com www palmerwahl com WD1014 Rev B 10 3 07 ...

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Страница 4: ...sales of temperature and pressure measuring devices for a variety of industries This product complies with current European directives relating to electromagnetic compatibility and safety EMC directive 89 336 EEC Low voltage directive 73 23 EEC All packaging material used for this product can be recycled Quality Assurance ...

Страница 5: ... 2 No 02 02 06 Three phase alternating Current IEC 417 No 5017 Earth ground terminal IEC 417 No 5019 Protective conductor terminal IEC 417 No 5020 Frame or chassis terminal IEC 417 No 5021 Equipotentiality IEC 417 No 5007 On supply IEC 417 No 5008 Off supply IEC 417 No 5172 Equipment protected throughout by double insulation or reinforced insulation equivalent to Class II of IEC 536 Safety Informa...

Страница 6: ...ation Refer to the operating instructions Note Do not dispose of this product together with your household waste Please refer to the information of your local community or contact our distributors regarding the proper handling of end of life electric and electronic equipment Recycling of this product will help to conserve natural resources and prevent potential negative consequences for the enviro...

Страница 7: ... SUPPORT Technical support for the Wahl DHS520 portable infrared thermometer can be obtained by using the contact details given on the cover of this User Guide or by e mail at the following address info palmerwahl com Technical Support ...

Страница 8: ...s Wahl manufacturer s warranty does not cover product malfunction arising from incorrect electrical wiring connection to electrical power sources outside the rating of the product physical shock being dropped etc and impact damage environmental conditions exceeding the IP NEMA rating of the product environmental conditions outside the ambient temperature humidity and vibration rating of the produc...

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Страница 10: ...B 5 4 0 THERMOMETER POWER SUPPLY OPTIONS 6 4 1 Using a Battery 6 4 2 Using an External Power Source 7 5 0 THERMOMETER CONTROLS 8 5 1 ON OFF Switch 8 5 2 Trigger Operation 8 5 3 LCD Display Panel Keypad 8 5 4 Adjustable Eyepiece 9 5 5 Optical Focus Ring 9 5 6 External Connection Socket 9 6 0 OPTICS 10 6 1 Target Size Calculation 10 6 2 Lens Options 11 6 3 Fitting a Close up Lens 11 6 4 Fitting a Da...

Страница 11: ...e 27 9 0 THERMOMETER OPERATION 28 9 1 Simple temperature measurement 29 9 2 Complex temperature measurement 29 10 0 DATASTREAMING 32 10 1 Serial Communications 32 10 2 Bluetooth Wireless Comms Wahl DHS520B 33 11 0 EMISSIVITY 34 11 1 Refractories 34 11 2 Alloys 35 11 3 Metals 36 11 4 Miscellaneous 37 12 0 MAINTENANCE 38 13 0 ACCESSORIES AND SPARE PARTS 39 13 1 Accessories 39 14 USER CONFIGURATION R...

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Страница 13: ...3000 C 1022 to 5432 F The thermometer can also measure and display these temperatures in Kelvin and Rankine The target temperature is measured and displayed in four simultaneous measurement types Peak Continuous Average and Valley You can choose which of these measurements is displayed in the internal viewfinder display The wide angle 9 field of view and the small 1 3 measurement point ensure that...

Страница 14: ...Page 2 Wahl DHS520 User Manual Fig 1 Wahl DHS520 520B portable infrared thermometer ...

Страница 15: ... make a note of the Instrument Type and Serial Number in the spaces provided below Instrument Type Serial Number 100 550 to 3000 C 1022 to 5432 F 1µm wavelength B Bluetooth communications variant 123456 unique instrument serial number 01 date code 315002 Fig 2 Wahl DHS520 520B portable thermometer nomenclature A second instrument label is positioned on the instrument chassis in the battery compart...

Страница 16: ...etector silicon photocell Spectral response nominally 0 85 to 1 10µm Emissivity adjustment 0 10 to 1 20 in 0 01 steps Response time digital display update 0 5 seconds approx peak and valley operation acquisition time 30ms approx Operating temperature range 0 to 50 C 32 to 122 F Storage temperature range 20 to 60 C 4 to 140 F Accuracy 0 25 of reading K or R Repeatability 1 C Drift with ambient temp...

Страница 17: ...CD display panel 7 Trigger switch 2 position 2 Keypad 8 External connection cover 3 Optical focusing ring 9 Tripod mounting hole 4 Protective window 10 Adjustable wrist strap 5 Lens cap 11 Adjustable eyepiece 6 ON OFF switch 12 Battery compartment cover Fig 3 Wahl DHS520 520B portable infrared thermometer description ...

Страница 18: ...y so that the terminals correspond with the label in the battery compartment see Fig 6 5 Insert the battery ensuring that the contact springs engage centrally into the battery terminals Slide the battery cover back into place and ensure that the cover catch engages with the thermometer chassis see Fig 7 6 With the battery fitted switch the instrument on and check for correct operation see Section ...

Страница 19: ...s designed to be powered by an internal battery it can be powered by a suitable external power source 9 to 12V d c 100mA rated Note If the thermometer is to be used with an external power source ensure that the internal battery is removed before applying external power To connect an external power source 1 Switch off the thermometer and remove the battery 2 Connect the external power source 9 to 1...

Страница 20: ... In History and Burst modes the trigger activates advanced functions within the thermometer see Section 8 0 5 3 LCD Display Panel Keypad 315010 d Fig 10 The LCD display panel d is on the left hand side of the thermometer body see Fig 3 item 1 It operates in two modes Measure Mode and Menu Mode In Measure Mode the scene temperature and thermometer setup information including battery life indication...

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Страница 22: ...mately 90 of rotation The datum mark h is on the instrument label on the right hand side of the thermometer As standard the thermometer is supplied with two protective windows The clear window is for general use and the dark window is for use where temperatures in the scene are likely to exceed 1200 C 2192 F A protective lens cap g is supplied and should be fitted at all times when the thermometer...

Страница 23: ...ex optical system gives a narrow field of view 180 1 to 98 energy As the instrument is focusable you can calculate an approximate target size from the information given in Fig 15 target distance D from optical datum field of view optical datum target size T Not to scale target diameter T mm target distance D from optical datum mm 100 field of view 180 or target diameter T in target distance D from...

Страница 24: ...ll be no significant calibration error so window compensation is not required 6 4 Fitting a Dark Filter When measuring temperatures above 1200 C 2192 F the image through the viewfinder is uncomfortably bright on the eye To counter this effect a dark filter must be fitted in place of the clear protection window To fit a dark filter to the Wahl DHS520 520B thermometer unscrew the clear protection wi...

Страница 25: ... the thermometer and view the target scene Accurate target definition is provided by the wide angle 9 field of view and small clearly defined 1 3 target reticule The eyepiece can be focused manually to match each user s eyesight characteristics 1 Use the viewfinder to view a plain brightly lit background such as a blank wall 2 Rotate the rubber eye cup to bring the reticule circle to the sharpest ...

Страница 26: ...asure Mode When the unit is in Measure Mode the display indicates the Peak Continuous Average and Valley temperature values simultaneously Scroll using the and keys to select and highlight the required measurement type This measurement type is then displayed in the viewfinder On the side LCD display panel the selected measurement type is displayed larger and bolder than the three non selected meas...

Страница 27: ...e on display jumps to instantaneous temperature value and rises with rise in object temperature c Object temperature falls last Peak temperature value held on display d New Peak temperature value reached display updated e Object temperature falls last Peak temperature value held on display f Trigger released last Peak temperature value frozen on display g Thermometer trigger pressed h Peak tempera...

Страница 28: ...s to select the required option from the menu With a Fast time constant selected the temperature reading closely matches the object temperature Only the most rapid fluctuations in the input are smoothed in the output With a Slow time constant selected the temperature reading is much smoother displaying more of a trend value rather than showing any rapid changes With a Mid time constant selected th...

Страница 29: ...er trigger pressed b Valley temperature value on display jumps to instantaneous temperature value and is held on display with rise in object temperature c Object temperature falls new Valley temperature value reached display updated as object temperature falls Object temperature rises last Valley temperature value held on display d Object temperature falls new Valley temperature value reached disp...

Страница 30: ...h the menu options The currently selectable menu item is highlighted by a flashing frame 3 To select a menu option press the key When a main menu option is selected the available sub options are displayed 4 Use the and keys to highlight the required sub option in the menu Press the key to select it 5 For sub options where a numeric value is required use the scroll keys to select the required numer...

Страница 31: ...values see Section 11 0 Emissivity The default value is 1 00 c d e Trigger Mode The trigger mode determines the way in which the thermometer operates and what happens to the readings taken by the instrument The are three trigger modes Classic c Burst d and History e See Section 8 0 Operational Trigger Modes The default trigger mode is Classic f g h Alarms The alarms function allows you to specify ...

Страница 32: ...Fahrenheit m Rankine n and Kelvin o The default setting is C p q r Backlight This option allows you to control the brightness of the side display backlight There are three backlight options available High p Low q and Off r When High or Low are selected a sub menu appears in which you can specify a time limit in seconds after which the backlight turns off if the thermometer is inactive The default ...

Страница 33: ...lows for the reflectivity of unusual combinations of thermometer windows This function can be selected On u or Off v If you switch the function On a screen is displayed in which you can set the required window compensation Use the and keys to adjust the value The default setting is 1 000 Examples Clear protection window fitted Window compensation Off Dark eye comfort filter fitted Window compensat...

Страница 34: ...k to the Palmer Wahl website x y Bluetooth Bluetooth communications allow wireless streaming of information from the thermometer to a remote facility This function is only available in Bluetooth enabled models The Bluetooth communication function can be set to On x or Off y The default is Off Note that with Bluetooth switched On the life of the battery will be reduced It is recommended that this f...

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Страница 36: ... CONSTANT MID SLOW C F UNITS R KEY K TOP LEVEL MENU BACKLIGHT HIGH LOW OFF 10s SUB MENU SUB MENU ACTION SET VALUES SOUNDER ON OFF DEFAULTS FACTORY SET DEFAULT ICON WINDOW COMPENSATION ON OFF 1 000 20s SCROLL UP DEFAULT VALUE ABOUT PRODUCT INFORMATION APPROVALS CALIBRATION SERIAL NUMBER BLUETOOTH IDENTIFIER SOFTWARE VERSION AMBIENT TEMPERATURES SCROLL DOWN TMAX TMIN SINCE LAST CALIBRATION WEBSITE L...

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Страница 38: ...Wahl DHS520 Page 24 Blank UserGuide ...

Страница 39: ...User Manual Wahl DHS520 ...

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Страница 41: ...two stage trigger functions T r i g g e r released T2 T1 8 2 Classic Mode Classic Mode is the simplest operating mode and the one that most closely resembles the operation of earlier Wahl portable thermometers In Classic Mode the trigger operation is single stage T1 only However note that in Classic Mode moving the trigger to the T2 position has no further effect All four measured temperature type...

Страница 42: ...igger was pressed to the T1 position The emissivity set point and window compensation indicator value in use are also output as part of the data packet The temperature components of this data packet are also retained within the instruments memory and may be viewed on the side display by going into Menu mode and re selecting twice on the History mode icon Note that further data packets will only be...

Страница 43: ...in the viewfinder When the trigger is pulled to the T2 position live temperature data only is streamed at the maximum collection rate approximately 33 readings per second to the serial port and the Bluetooth module This mode of operation is denoted by the internal display blinking in unison with the sounder beeping if switched on at approximately 0 5 second intervals When the trigger is released a...

Страница 44: ...nto three different setup groups Data Output Setup User Interface Setup Measurement Setup The following list details the setup groups and the available selections Setup Group Function Selection Options Data Output Setup Trigger Mode Classic History Burst Bluetooth On Off User Interface Setup Trigger Mode Classic History Burst Backlight High enter timer value Low enter timer value Off Sounder On Of...

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Страница 46: ...5 Enter the Emissivity value for the material under observation refer to the tables in Section 11 0 6 Ensure that Window Compensation is Off 7 Ensure that the Alarms function is set to Off 8 Ensure the Bluetooth option is set to Off Wahl DHS520B variants only 9 On the side display select the Continuous temperature measurement option see Section 7 2 10 Adjust the eyepiece to suit the user See Secti...

Страница 47: ... to a reduction in the amount of radiant energy reaching the thermometer from the target The following instructions detail the operation of a Wahl DHS520 520B in a typical complex temperature measurement application as in Fig 23 1 2 1 Viewing port window Glass typical window compensation factor 0 920 2 Hot target Mild steel typical emissivity value 0 35 315023 Fig 23 Typical complex temperature me...

Страница 48: ...ion set to 1 000 8 Place a spare viewing window port between the thermometer and the blackbody heat source and take a new temperature reading 9 Enter the Window Compensation On sub menu and amend the Window Compensation factor value with the and keys until the display temperature reads the same as the recorded value taken from the known value source You must now use this Window Compensation value ...

Страница 49: ...sabled prior to using wired serial communications from a Wahl DHS520B thermometer variant 1 Switch off Bluetooth communication Wahl DHS520B variants only 2 Ensure that the datalogging software has been loaded to the PC laptop or Pocket PC as required 3 From the Wahl DHS520 520B connect the serial cable to the PC laptop or the Pocket PC as required 4 Select the required Trigger Mode on the Wahl DHS...

Страница 50: ... as required 2 Establish Bluetooth communications from the Wahl DHS520B to a laptop PC Pocket PC 3 When Bluetooth communications is active the Bluetooth logo on the thermometer side display holds steady and a I0I0I icon appears a flashing logo indicates lost Bluetooth communications 4 Select the required Trigger Mode on the Wahl DHS520 520B 5 Press the trigger to capture and stream data release th...

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Страница 52: ...y value is quoted this means that either the thermometer is not suitable for the measurement application or the temperature of the target is outside the thermometer s measurement span If you have a query regarding the emissivity of the target in your measurement application contact Palmer Wahl for assistance 11 1 Refractories Material Wahl DHS520 520B Alumina 0 30 Brick Red 0 80 White refractory 0...

Страница 53: ...aterial Wahl DHS520 520B Brass 0 20 Oxidized 0 70 Chromel Alumel 0 30 Oxidized 0 80 Constantin Manganin 0 25 Oxidized 0 65 Inconel 0 30 Oxidized 0 85 Monel 0 25 Oxidized 0 70 Nichrome 0 30 Oxidized 0 85 Fig 25 Typical Emissivity Values for Alloys ...

Страница 54: ...idized 0 85 Gold 0 05 Iron Steel 0 35 Oxidized 0 85 Lead 0 35 Oxidized 0 65 Magnesium 0 27 Oxidized 0 80 Molybdenum 0 33 Oxidized 0 80 Nickel 0 35 Oxidized 0 85 Palladium 0 28 Platinum 0 27 Rhodium 0 25 Silver 0 05 Oxidized 0 10 Tin 0 40 Oxidized 0 60 Titanium 0 55 Oxidized 0 80 Tungsten 0 39 Zinc 0 50 Oxidized 0 60 Fig 26 Typical Emissivity Values for Metals 315026 ...

Страница 55: ...sbestos Board paper cloth 0 90 Asphalt 0 85 Carbon Graphite 0 85 Soot 0 95 Cement Concrete 0 65 Cloth All types close weave 0 75 Open weave reduces emissivity Glass 3mm thick 6mm thick 12mm thick 20mm thick 0 80 Fig 27 Typical Emissivity Values for Miscellaneous Materials 315027 ...

Страница 56: ...assembly eyepiece and display panel are kept clean and free from contaminants On a regular basis clean these components carefully with a soft lens cloth and proprietary lens cleaner Check the thermometer for damage regularly Pay particular attention to the lens assembly eyepiece display panel trigger and on off switch Ensure that a spare fully charged battery is kept with the thermometer at all ti...

Страница 57: ...e with the standard lens The Type 110 L 110 lens has a fixed focus at 215mm 8 5in with a minimum target size of 0 4mm 0 016in A typical application for this lens is hot filament wire observation The Type 135 L 135 lens has a focus range of 450mm 17 7in to 620mm 24 4in with a minimum target size of 1 8mm 0 07in A typical application for this lens is calibration on small aperture furnaces 315028 Fig...

Страница 58: ... giving full environmental protection It is supplied with custom cut foam cushioning with cut outs for the thermometer and any supplied accessories allowing all items of the kit to be kept together for convenience Dimensions 14 2 x 11 4 x 6 5in 360 x 290 x 165mm width x length x depth 315029 315030 Fig 29 Hard carry case closed Fig 30 Hard carry case open ...

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Страница 60: ...lmer Wahl for repair or recalibration it is possible that your stored user settings may be overwritten and the thermometer returned to you with the factory default settings Therefore it is recommended that once you have set up the thermometer to match your measurement requirements you use the User Configuration Record overleaf to make a note of your chosen parameter settings and values so that the...

Страница 61: ...neous Averaged Valley Menu Mode Emissivity value Data Output Mode Classic Historic Burst Alarm Settings Alarm off High alarm value Low alarm value Averager setting Slow Mid Fast Temperature units C F K R Backlight Setting Off Dim timer Bright timer Sounder Setting Off On Window transmission Off On value ...

Страница 62: ... of fixed 12 character length is output every 0 5 0 1seconds EXAMPLE B C C I 972 0 CR LF i Identifier B C100 D C055 ii Packet C Classic while key pressed H Hold when key released iii Units C Celsius F Fahrenheit R Rankin K Kelvin iv Mode I Instantaneous P Peak V Valley A Average v Data In tenths up to 999 9 In degrees after 1000 Over range is _ _ _ i e 0xAF SP 0xAF SP 0xAF Under range is _ _ _ i e...

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Страница 64: ...LF B 2 C E 1 000 CR LF B 2 C T 1 000 CR LF or if disabled B 2 C T OFF CR LF As per Advanced Mode data stream except i Packet 2 Advanced History mode packet ii Mode E Emissivity T Window Transmission iii Data In thousandths for emissivity transmission The IPAQ should send a handshake to indicate packet reception Advanced Burst Mode packet When T2 is pressed in burst mode a continuous stream of line...

Страница 65: ...Advanced Bluetooth Heartbeat To maintain the Bluetooth link and to establish that the logger program is running the following dummy data can be sent B 0 C x xxxxxx CR LF The IPAQ should send a handshake to indicate heartbeat reception ...

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