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4-4 Advanced Functions 

To operate advanced functions, pull the trigger and use 
the 

MODE

 button to select the desired function. Advanced 

function data is displayed on the Secondary Display. Mode 
button also works with unit in Hold mode. The sequential 
operations are shown in the following flow-chart. 

 
 

 
 
 
 
 
 

 Scan and display the current 

temperature. 

 Store data when flashing. 

Recall data when steady. Use 

 or 

 button to select. 

 Dislays the maximum 

temperature obtained in current 
measurement cycle. 

 Displays the minimum 

temperature obtained in current 
measurement cycle. 

 Displays the average 

temperature of current 
measurement cycle, (approx 73 
seconds.) 

 Displays the maximum 

temperature difference obtained 
in current measurement cycle. 

 Allows emissivity adjustment 

for correction of different 
materials. 

 Adjust High alarm 

temperature setting setpoint. 

 Adjust Low alarm 

temperature setting setpoint. 

 Alarm setpoints are adjusted 

by using 

 or 

.

 

4-5 Memory 

4-5.1

 Memory Read – Press 

MODE

 switch until 

DATA (0-

A)

  is  on  steady.  Unit  is  now  in  Data  Read  mode  for 

memory locations 

DATA (1-A)

 or Memory Erase mode 

when  displaying 

DATA0

.  (See  Memory  Erase  section 

below).  Pressing  the  ▲  or  ▼  arrows  will  scroll  the 
DATA  location  and  display  the  corresponding  data  on 
the secondary display. The specific parameter, such as 
Actual,  Max,  Min,  Etc,  will  also  be  displayed.  No 
parameter  displayed  indicates  the  data  is  the  Actual 
measurement. 

4-5.2

  Memory  Erase  –  when 

DATA0

  is  selected,  the 

secondary display will display “-

CL

-”. This is only used 

for  erasing  all  the  memory  locations.  To  Erase,  press 
and  hold  the  M  Button  until  you  hear  a  quick  double 
beep. 

Note:

 Data cannot be saved into DATA0 location. 

4-5.3

  Memory  Record  –  the  following  temperature 

parameters may be saved into memory: Actual reading, 
MAX,  MIN,  AVG,  and 

T.  To  select which  one will  be 

saved,  press  the 

MODE

  switch  until  the  desired 

parameter  is  selected  with  the 

DATA  (1-A)

  icon 

flashing.  The  flashing 

DATA  (1-A)

  icon  indicates  the 

unit is in Data  Save  mode and which  memory location 
is currently selected. 
To  select  a  specific  memory  location,  press  the  ▲  or 
▼  arrows  until  the  desired  location  is  displayed.  To 
save  the  displayed  data  into  memory,  press  the  M 
button until a single beep is heard. 

The unit will: 

  Save  the  data  that  is  displayed  on  the  lower 

secondary display. 

  Write  new  data  over  any  previously  saved  data  in 

that memory location. 

 Increment the memory location to the next location. 

 
 

 

 

Summary of Contents for DHS235XEL

Page 1: ...DHS235XEL WD1048 Rev A 04 10 10 High Performance Infrared Thermometer with High D S Ratio Adjustable Emissivity and Built in Laser Sighting ...

Page 2: ...5 4 1 Quick Start 5 4 2 Unit Diagram 5 4 3 Displays and Controls 5 4 3 1 Displays 5 4 3 2 Lock 5 4 3 3 C F Switch 5 4 3 4 Laser 6 4 3 5 Battery 6 4 4 Advanced Functions 7 4 5 Memory 8 4 5 1 Memory Read 8 4 5 2 Memory Ease 8 4 5 3 memory Record 8 5 Technical Information 9 5 1 Distance to Spot Ratio 9 5 2 Emissivity 9 Emissivity Table 10 6 Maintenance 11 6 1 Lens 11 6 2 Housing 11 ...

Page 3: ...afety and processing Perform HVAC energy audits 1 Read the following safety information carefully before attempting to operate or service the instrument Only qualified personnel should perform repairs or service not covered in this manual 2 1 Warning DO NOT submerge the instrument in water This product is not designed for use in medical evaluations This product is intended for use in industrial sc...

Page 4: ...re of 25 C 77 F 5 4 F 3 C From 58 to 4 F 50 to 20 C 3 F 2 C From 4 to 212 F 20 to 100 C 2 From 212 to 2732 F 100 to 1500 C Spectral Range 8 to14µm Repeatability 2 F 1 C Resolution 0 1 F or C Response Time 500 mS Operation Temp 32 to 122 F 0 to 50 C 10 to 90 RH Auto Power Off Automatically after approx 6 seconds Emissivity Adjustable 0 10 to 1 00 F C Switchable YES Backlight YES Laser Sight Switcha...

Page 5: ...Secondary display The unit will HOLD the last reading for 6 seconds after the trigger is released 4 3 2 Lock Push the button to continuously measure and display the temperature without pulling the measuring trigger 4 3 3 C F Switch the C F switch is located in the battery compartment and is accessed by following steps 1 and 2 on pg 6 5 4 3 4 Laser On Off Switch the Laser On Off Switch is located i...

Page 6: ...g DATA0 See Memory Erase section below Pressing the or arrows will scroll the DATA location and display the corresponding data on the secondary display The specific parameter such as Actual Max Min Etc will also be displayed No parameter displayed indicates the data is the Actual measurement 4 5 2 Memory Erase when DATA0 is selected the secondary display will display CL This is only used for erasi...

Page 7: ...inaccurate measurement due to the averaging of the target with the surrounding areas 5 2 Emissivity Emissivity is the relative ability of an object to emit energyby radiation Perfect emitters have an emissivity of 1 emitting 100 of incident energy An object with an emissivity of 0 8 will absorb 80 and reflect 20 of the incident energy Emissivity is defined as the ratio of the energy radiated by an...

Page 8: ...Lens clean the lens by blowing off loose particles using clean compressed air Gently brush remaining debris away with a camel hair brush Use a cotton swab moistened with distilled water to carefully wipe the lens surface Note DO NOT use solvents to clean the lens 6 2 Housing Clean by wiping with a damp soft cloth Mild detergent may be used as needed 11 Wahl Instruments Inc 234 Old Weaverville Road...

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