Wahl Heat Spy DHS520, Heat Spy DHS520B User Manual

Wahl Heat Spy®

DHS520/520B

Po r t a ble Inf r a r ed T her m o me t er

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

User Manual Wahl DHS520

The Quality Management System of Wahl Instruments Inc. is approved for the design, manufacture, and 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

Wahl DHS520

User Manual

SAFETY INFORMATION

SYMBOL PUBLICATION DESCRIPTION

Direct

IEC 417, No.5031

Current

IEC 417, No.5032

Alternating

Current

IEC 417, No.5033

Both direct and

alternating current

IEC 617-2, 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 Information

User Manual Wahl DHS520

SAFETY INFORMATION (CONTINUED)

SYMBOL PUBLICATION DESCRIPTION

ISO 3864, No. B.3.6

WARNING

Risk of electric shock

ISO 3864, No. B.3.1

Caution

BS EN 100015

BS EN 60825-1

Observe precautions for

handling electrostatic

discharge sensitive

devices

WARNING

Laser Radiation

Refer to the operating

instructions

Note

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 environment and human health caused by inappropriate waste handling

Safety Information

Wahl DHS520

User Manual

TECHNICAL 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

by e-mail at the following address: info@palmerwahl.com.

Technical Support

User Manual Wahl DHS520

PRODUCT WARRANTY

12 MONTH WARRANTY

Thank you for purchasing your new product from Palmer Wahl. This warranty covers product malfunctions arising from defects in design or manufacture. The warranty period begins on the date product is shipped from the factory in Asheville, NC.

EXCLUSIONS FROM WARRANTY

It should be noted that costs associated with calibration checks which may be requested during the warranty period are not covered within the warranty. Wahl reserves the right to charge for service/calibration checks undertaken during the warranty period if the cause is deemed to fall outside the terms of the warranty. This 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 product.

• environmental contamination (solvent vapors, deposition of airborne contamination, cooling liquids of non-neutral pH, etc.).

• overheating as a result of interruption of water/air flow through cooling jackets or of incorrect installation.

• inappropriate modification (drilling holes in thermometer bodies, etc.).

• inappropriate recalibration resulting in calibration outside specification.

• attempted repair by a non-Wahl-authorized repair center.

Product Warranty

Wahl DHS520

User Manual

CONTENTS

QUALITY ASSURANCE

SAFETY INFORMATION

TECHNICAL SUPPORT

PRODUCT WARRANTY

1.0 INTRODUCTION 1

1.1 General Introduction

1.2 About Wahl DHS520/520B Portable Thermometers

1.3 Nomenclature

2.0

SPECIFICATIONS

3.0

THERMOMETER DESCRIPTION

3.1 Wahl DHS520/520B 5

4.0 THERMOMETER POWER SUPPLY OPTIONS 6

4.1 Using a Battery

4.2 Using an External Power Source

5.0 THERMOMETER CONTROLS 8

5.1 ON/OFF Switch

5.2 Trigger Operation

5.3 LCD Display Panel & Keypad

5.4 Adjustable Eyepiece

5.5 Optical Focus Ring

5.6 External Connection Socket

6.0 OPTICS 10

6.1 Target Size Calculation

6.2 Lens Options

6.3 Fitting a Close-up Lens

6.4 Fitting a Dark Filter

6.5 Fitting a Dark Filter to a Close-up Lens

6.6 Eyepiece Optics

Contents

Wahl DHS520

CONTENTS (CONTINUED)

User Manual

7.0 DISPLAY PANEL MODES 13

7.1 Introduction

7.2 Measure Mode

7.3 Menu Mode

7.4 Menu Mode - Icon Descriptions

8.0 OPERATIONAL (TRIGGER) MODES 25

8.1 Introduction

8.2 Classic Mode

8.3 History Mode

8.4 Burst Mode

9.0 THERMOMETER OPERATION 28

9.1 Simple temperature measurement

9.2 Complex temperature measurement

10.0

DATA STREAMING

10.1 Serial Communications

10.2 ‘Bluetooth’ Wireless Comms (Wahl DHS520B)

11.0

EMISSIVITY

11.1 Refractories

11.2 Alloys

11.3 Metals

11.4 Miscellaneous

12.0

MAINTENANCE

13.0

ACCESSORIES AND SPARE PARTS

13.1 Accessories

USER CONFIGURATION RECORD

APPENDIX

Serial Communications Data Logging Protocol

Contents

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User Manual Wahl DHS520

1.0 INTRODUCTION

1.1 General Introduction

This publication gives you the information required to safely operate Wahl DHS520/520B portable thermometers.

It is important to check all equipment with which you have been supplied, and read all the literature provided with the Wahl DHS520/520B before using the thermometer for the first time. Additionally, keep all supplied literature readily available, for reference when the equipment is in general use.

The equipment must only be used and maintained by suitably trained personnel, capable of following the procedures and guidelines given in this User Guide and the Wahl DHS520/520B Quick-Start Guide.

1.2 About Wahl DHS520/520B Portable Thermometers

The Wahl DHS520/520B is a highly accurate, portable, short wavelength infrared thermometer, designed to measure and display temperatures in the range 550 to 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 the target is defined clearly and accurately. The focus is continuously variable from one meter to infinity. Auxiliary lenses are available, which provide close focus capability.

The emissivity compensation setting can be controlled digitally, via the simple to use, icon-based menu system, which is available at the touch of a button.

The operating waveband has been chosen specifically to minimize errors due to uncertainty in emissivity, while eliminating the effects of atmospheric absorption.

Both models feature RS232 serial communications, with simple configuration of the available data output formats. The Wahl DHS520B variant also features user-friendly ‘Bluetooth’ communications.

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Fig. 1 Wahl DHS520/520B portable infrared thermometer

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1.3 Nomenclature

The instrument detail label is positioned centrally, on the right-hand side of the Wahl DHS520/520B casing. The Instrument Type specifies the thermometer variant and the Serial Number is a unique identification number, incorporating the manufacture date code (see Fig. 2)

Upon receipt of the instrument, 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 compartment. This label displays the instrument serial number, the unique ‘Bluetooth’ address (Wahl DHS520B variants only) and the recommended battery details.

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2.0 SPECIFICATIONS

Temperature range: 550 to 3000°C / 1022 to 5432°F (actual)

600 to 3000°C / 1112 to 5432°F (specified)

Viewfinder display: 4-digit temperature in 1° steps

External display: Peak, Continuous, Average and Valley temperatures

on LCD display panel

Optical system: 9° field of view with 1/3° measuring circle; single-lens-

reflex system; with eyepiece adjustment from -3.75 to +2.5 diopters

Focusing: 1m/39.4in. to infinity (standard) from body datum

nominally 450 to 620mm/17.7 to 24.5in. (135 c.u.lens) nominally 215mm/8.5in. fixed focus (110 c.u. lens)

Minimum target diameter: 4.8mm/0.19in. at 101.4cm/39.9in. (standard)

1.8mm/0.07in. (135 close-up lens)

0.4mm/0.02in. (110 close-up lens)

Detector: 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 temperature: <0.15%(C)/10°C, <0.10%(F)/10°F

Power source: one 9V dry battery (Duracell 6LR61/12232 or

equivalent); typical alkaline battery life: >100hrs in ‘from-factory’ configuration

Digital outputs:

ASCii code; RS232 serial out

IP rating: IP40

Dimensions:

210 x 70 x 140mm / 8¼ x 2¾ x 5½in.

Weight: 800g/1lb12oz (without battery)

Standard accessories: lens cap; 9V alkaline battery; protective window; dark

glass eye protection filter; wrist strap

Optional accessories: type 135 and 110 close-up lenses; protective hard

carry case.

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3.0 THERMOMETER DESCRIPTION

3.1 Wahl DHS520/520B

315003

LCD display panel

Trigger switch (2 position)

Keypad

External connection cover

Optical focusing ring

Tripod mounting hole

Protective window

Adjustable wrist strap

Lens cap

Adjustable eyepiece

ON/OFF switch

Battery compartment cover

Fig. 3 Wahl DHS520/520B portable infrared thermometer description

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4.0 THERMOMETER POWER SUPPLY OPTIONS

4.1 Using a Battery

The Wahl DHS520/520B portable thermometer is designed to be powered by a 9V dry cell battery. A Duracell 6LR61/12232 (or equivalent) battery is supplied with the thermometer. The battery is fitted as follows:

Fig. 4

Fig. 5

Fig. 6

Fig. 7

315004

315005

315006

315007

1) Before inserting or changing the battery, ensure that the thermometer is switched OFF.

2) The battery cover is on the top surface of the thermometer body (see Fig. 4).

3) Press down on the finger grip of the battery cover to disengage the cover catch and slide the cover back to fully expose the battery compartment (see Fig. 5).

4) A lig n th e bat tery so th at the te rmin als co rres po nd wi th the la bel i n t he b att er y 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 7.0). When switched on, a battery power indicator appears in the LCD display panel, which gives an indication of how much power is left in the battery.

When the battery needs replacing, the battery indicator on the LCD display panel will flash. To prolong the remaining battery life, the display backlight and ‘Bluetooth’ (DHS520B only) should be switched off. The battery should be changed as soon as possible in order to ensure that the readings from the instrument remain within specification.

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Note

It is recommended that a fully charged spare battery is kept with the thermometer at all times.

To preserve battery lifetime, the thermometer has the following power saving features:

• If the thermometer is in Menu Mode for over one minute without any key being pressed, the display returns to Measure Mode.

• If the thermometer is in Measure Mode for over two hours without any key being pressed, the instrument is switched off.

4.2 Using an External Power Source

Although the Wahl DHS520/520B portable thermometer is 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 12V d.c./100mA rated) to a ‘HIROSE’ connector (HR10-10P-12P). Connect the ‘positive’ to pin 5 and the ‘0V’ to pin 7.

3) Remove the rubber cover from the external connection socket, located near the base of the thermometer (see Fig. 3, item 8).

4) Connect the ‘HIROSE’ plug to the external connection socket.

5) Switch the thermometer ‘ON’ and check for correct operation.

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5.0 THERMOMETER CONTROLS

5.1 ON/OFF Switch

Fig. 8

315008

The On/Off switch is on the left-hand side of the thermometer (see Fig. 3, item 6). The switch has two push buttons, Off (a) and On (b).

A single press of the switch will activate/de-activate the unit.

5.2 Trigger Operation

Fig. 9

315009

The Trigger (c) is on the thermometer handle (see Fig. 3, item 7). The trigger function depends upon the chosen mode of operation: Classic, History or Burst. In Classic mode, the trigger has one function, to read and display temperature. In History and Burst modes, the trigger activates advanced functions within the thermometer (see Section 8.0).

5.3 LCD Display Panel & Keypad

315010

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) is displayed.

In Menu Mode, the function menus of the thermometer can be accessed. You can select functions and set the required parameters, as described in Section 7.0.

There are three action keys on the Keypad to the left of the main display:

(Scroll Up), (Scroll Down)

and (Enter/select). These are used to navigate around the various menus and displays.

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5.4 Adjustable Eyepiece

315011

Fig. 11

The Adjustable Eyepiece (e) is on the rear face of the thermometer (see Fig. 3, item 11).

The eyepiece allows you to view the scene being measured by the thermometer. The eyepiece can be adjusted manually to match each user ’s eyesight

characteristics (See section 6.6).

5.5 Optical Focus Ring

315012

315013

Fig. 12

Fig. 13

The Optical Focus Ring (f) is on the lens assembly at the front of the thermometer (see Fig. 3, item 3). The focus ring allows you to manually adjust the lens assembly and sharpen the scene in view.

The focal range is 1m/39.4in (as measured from the instrument datum) to infinity, which equates to approximately 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 is not in use.

5.6 External Connection Socket

Fig. 14

315014

The External Connection Socket (i) is on the left-hand side of the thermometer handle (see Fig. 3, item 8).

The socket has two main functions: it allows an external power source to be connected to the thermometer, and it enables the thermometer to interface with an IPAQ or laptop, giving datalogging facilities via serial RS232 communications.

The protective rubber cover should be fitted at all times when the socket is not in use.

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6.0 OPTICS

User Manual

The Wahl DHS520/520B has a precision reflex optical system, which provides user-focusable ‘through the lens’ sighting and gives precise definition of the target spot. The specified focal range is 1m/39.4in to infinity.

6.1 Target Size Calculation

The precision reflex 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)

target diameter (T) (in) = target distance (D) from optical datum (in) - 4

field of view (180)

315015

Fig. 15 Wahl DHS520/520B thermometer target size calculation

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6.2 Lens Options

The Wahl DHS520/520B is supplied, as standard, with a protective window which covers and protects the instrument lens.

Palmer Wahl can supply optional close-up lenses, which enable smaller targets to be measured.

CAUTION

Never look at the sun through this instrument - this could cause

severe damage to the eye. When measuring temperatures above 1200°C/2192°F, a dark filter must be fitted to the lens assembly.

6.3 Fitting a Close-up Lens

To fit a close-up lens to the Wahl DHS520/520B thermometer, unscrew the clear protection window from the lens assembly and replace it with the relevant close-up lens.

The optical transmission characteristics of the protection window and the closeup lens are similar. Therefore, there will 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 window from the lens assembly and replace it with the dark filter.

The optical transmission characteristics of the protection window and the dark filter are similar. Therefore, there will be no significant calibration error, so window compensation is not required.

6.5 Fitting a Dark Filter to a Close-up Lens

When measuring a small target where the temperature rises above 1200°C/ 2192°F, the image through the viewfinder becomes uncomfortably bright on the eye. A close-up lens and a dark filter combination must be fitted in place of the clear protection window. (Continued...)

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To fit a dark filter and close-up lens combination, unscrew the protection window from the lens assembly and replace it with a close-up lens (first), followed by a dark filter. As there is now an extra optical element in the sight path of the instrument, a window compensation factor of 0.93 must be entered to allow for the associated energy losses.

6.6 Eyepiece Optics

target reticule

(1/3° circle)

Not to scale

display panel

temperature

reading

315016

Fig. 16 Wahl DHS520/520B Eyepiece Optics

The eyepiece allows you to look into 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 possible focus. The eyepiece is now adjusted to your eye.

3) Adjust the main focusing ring to bring the target scene to the sharpest possible focus on the reticule circle.

When a temperature reading is taken (the trigger pressed), the measured value is displayed in the eyepiece display panel. The temperature is displayed in the units selected from the Main Menu.

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7.0 DISPLAY PANEL MODES

7.1 Introduction

The LCD display panel has two basic modes of operation:

• Measure Mode

• Menu Mode

When the thermometer is switched on, an introduction screen is displayed. This screen times-out automatically and is replaced by the Measure Mode display.

To access the Menu Mode from the Measure Mode, press the (Enter/ select) key on the keypad.

7.2 Measure 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 measurement types. Note that the thermometer measures in all four measurement types continuously.

Peak reading

Continuous

reading

Average reading

Valley reading

Fig. 17 Typical ‘Measure Mode’ display

315017

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7.2.1 Peak temperature measurement

The Peak temperature measurement mode is used to measure and display information about the highest temperatures recorded by the thermometer.

The peak temperature values can be viewed in the instrument eyepiece and streamed to the serial or ‘Bluetooth’ outputs.

fluctuating object

temperature reading

315018

Fig. 18 Graphical representation of typical Peak temperature measurement

a Thermometer trigger pressed

b Peak temperature value 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 temperature value on display jumps to instantaneous temperature

value (even if lower than last Peak value held before trigger release). Peak temperature value held on display

i New Peak temperature value reached, display updated as object

temperature rises

j Object temperature falls, last Peak temperature value held on display

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7.2.2 Continuous temperature measurement

Continuous temperature measurement provides the real-time observed temperature value. The temperature is updated continuously and the value is viewed in the instrument eyepiece.

7.2.3 Averaged temperature measurement

Averaged temperature measurement gives a ‘smoothed’ temperature value. To

use the averaging function, press and hold down the trigger. The averaging

function operates for the period during which the trigger is held down. Averaging stops when the trigger is released.

The response time of the averaging is controlled by the Averager Time Constant setting in Menu Mode. The options are Slow, Mid and Fast. Use the and keys 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, the temperature reading is calculated somewhere between the fast and slow time constant values.

‘Slow’ averager

time constant

‘Fast’ averager

time constant

‘Mid’ averager

time constant

fluctuating object

temperature reading

315019

Fig. 19 Graphical representation of typical Averaged temperature

measurement with Slow, Mid and Fast time constants

a Thermometer trigger pressed

b Averaging is initiated at the instantaneous temperature value. Averaged

temperature values are calculated, displayed and updated

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7.2.4 Valley temperature measurement

Valley temperature measurement is the inverse of Peak temperature measurement, in that it allows you to monitor the lowest temperature value rather than the highest. Temperature measurement starts when the trigger is pressed in and continues until the trigger is released (See Fig. 20).

The temperature is updated instantaneously and the value is viewed in the instrument eyepiece. It is also streamed to the serial or ‘Bluetooth’ outputs (if fitted).

fluctuating object

temperature reading

315020

Fig. 20 Graphical representation of typical Valley temperature measurement

a Thermometer 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, display

updated as object temperature falls. Object temperature rises, last Valley temperature value held on display

e Trigger released, last Valley temperature value frozen on display

f Trigger pressed

g Valley temperature value on display jumps to instantaneous temperature

value (even if higher than last Valley value held before trigger release). Display updated as object temperature falls

h Object temperature rises, last Valley temperature value held on display

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7.3 Menu Mode

When the thermometer is in Menu Mode, the menu options available in the Wahl DHS520/520B thermometer can be accessed. This allows you to view and configure the setup of the thermometer and select the options that best suit your temperature measurement requirements.

At start-up and during normal operation, the thermometer is in Measure Mode.

1) To access Menu Mode press the key.

The main menu options are displayed as icons. There are 11 main menu options, although only 8 icons are displayed within the screen at any one time (See Fig. 21).

2) Use the and keys to scroll through 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 numeric value, then click on the key to set this

value. For example, to change the emissivity from 1.00 to 0.78, select the Emissivity menu, then press and hold in the key to change the value from 1.00 to 0.78. If you ‘overshoot’ the value, use the key to return to the required value

6) When you have set a required parameter value, press the key to return to the main menu options.

Fig. 21 Typical ‘Menu Mode’ screen display

315021

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7.4 Menu Mode - Icon Descriptions

The information in this chapter should be used in conjunction with the navigational flow chart (see Fig. 22).

(a) Exit

When in Menu Mode, clicking on the exit icon (a) will return you to Measure Mode. The icon is also used in History Mode setup, to return back to Trigger Mode.

(b) Emissivity

Clicking on the emissivity icon (b) will open a screen in which the emissivity value can be set. Use the and

keys to enter t he r equired value. For a

comprehensive list of emissivity 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 alarm values for the scene under observation. The function has three sub-options: High Alarm (f), Low Alarm (g) and Alarm Off (h). When high or low alarms are selected,

a value setting screen appears. Use the and keys to enter the alarm trigger temperature. The default setting for High and Low alarm is the thermometer mid-range value.

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(i) (j) (k)

Averager time constant : the averager time constant function allows you to set the rate of averaging of the temperature values taken. There are three options: Fast (i), Mid (j) and Slow (k). The default setting is Mid.

(l) (m)

(n)

(o)

Units

This menu allows you to select the unit of measurement. There are four options: °Celsius (l), °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 setting is Off.

Note: Use of the backlight will reduce the life of the battery. It is recommended that the backlight is switched off when not required.

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(s) (t)

Sounder

This option allows you to either switch on or mute the sounder. When switched on, the sounder indicates trigger operation, alarm trip, active communications response, and los t communications response (Bluetooth). The available sounder options are: Sounder On (s), or Sounder Off (t). The default setting is On.

(u) (v)

Window compensation

This function allows you to manually incorporate a known compensation value into the temperature calculation, which allows 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 compensation Off

Close-up lens fitted : Window compensation Off

Eye comfort filter and Window compensation On close-up lens fitted : Value set to 0.93

Any combination of the Window compensation On above and an external value to be determined practically viewing window into the customer process :

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(w)

About

This function (w) accesses general information about the product. The details displayed include: calibration information, thermometer serial number, Bluetooth identifier (for Bluetooth models), software version, Tmax and Tmin ambient temperature readings since last calibration and a link 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 function is switched Off when not required.

The complete set of menu options is indicated as a flowchart shown in Fig. 22.

User Manual Wahl DHS520

Page 22 (Blank)

Page

Use

Guide

MEAS URE MOD E

EXIT

EMI SSIVITY

1.00

BURS T MOD E

TRIG GER MOD E

ALARM S

AVE RAGER TIME

CONS TANT

UNI TS

BAC KLIGHT

HIS TORY MOD E

CLAS SIC MOD E

OFF

HIGH

ALARM

LOW

ALARM

FAS T

MID

SLOW

°C

°F

°R

HIGH

LOW

OFF

1800 °C

10s

SOU NDER

WIND OW

COM PENSAT ION

Bluetoo th not fitte d

ABO UT

OFF

PRODUCT INFORMATIO N

APPROVALS, CALIBRATION, SERIAL NUMBER, BLUETOOTH IDENTIFIER, SOFTWARE VERSION, AMBIENT TEMPERATURE S (TMAX/TMIN) SINCE LAST CALIBRATION, WEBSITE LINK

1.00 0

Peak Temp. Value (units)

Continuous Temp. Value (units)

Average Temp. Value (units)

Valley Temp. Value (units)

KEY

TOP LEVE L MEN U

SUB MEN U

SUB MENU ACTI ON/

SET VALU ES

DEFA ULTS (FAC TORY SET)

DEFA ULT ICO N

20s

DEFA ULT VALU E

SCROLL UP

SCROLL DOWN

ENTER

_ _ _ _ (units)

BLUE TOOTH

Blueto oth fitted

OFF

315022

Fig. 22 - Wahl DHS520/520B Icon navigational flow chart

Wahl DHS520

Page 24 (Blank)

User Guide

User Manual Wahl DHS520

Page

8.0 OPERATIONAL (TRIGGER) MODES

8.1 Introduction

The Wahl DHS520/520B thermometer has three operating modes:

• Classic

• History

• Burst

The thermometer trigger is used to control the operation of the thermometer in each mode. The trigger has two stages: T1 and T2 (See inset).

A light press on the trigger will move it to position T1, at which point a stronger press will be required to move the trigger a small, further distance to the second position T2.

This section of the user guide describes the measurement and data collection options available by using the two-stage trigger functions.

T r i g g e r released

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 types (Peak, Continuous, Average and Valley) are displayed on the side LCD panel, although only the highlighted temperature type is displayed in the viewfinder and streamed serially to the DA- LOG datalogging software (wired connection or via Bluetooth). Data is streamed in

0.5s intervals when the trigger is pressed in. When the trigger is released,

streaming stops and the temperature is logged.

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Wahl DHS520

8.3 History Mode

In History mode all data collection and transfer is controlled by the dual stage trigger operation. In summary, the T1 position is used to align the instrument on the chosen target and the T2 position is used to generate the logged data.

With the trigger pulled to the T1 position, operation is exactly the same as in Classic mode. All four temperature types (Peak, Continuous, Average and Valley) are displayed with the selected (highlighted) type being displayed internally within the viewfinder as well as being streamed serially in 0.5 second intervals (wired connection or Bluetooth).

If the trigger is pulled to the T2 position, this is confirmed by a single ‘blink’ on the internal viewfinder, coupled with a single ‘beep’ on the sounder (if switched on). When the trigger is pulled to the T2 position, both the viewfinder and side displays are ‘frozen’ and a ‘packet’ of data is generated and sent out for data logging. This packet of data comprises the overall peak, last continuous, overall average and overall valley temperature measurements taken during the time that the trigger 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 added after each press of the trigger to the T2 position and the data added will be the measurements made at the T1 position during the time preceding the press to T2. Any measurement made at the T1 position without going to the T2 position will not be stored.

If additional data is added, any higher peak (or lower valley) temperature recorded will overwrite the earlier stored value. The new average value will then become the average over all stored data and the continuous value displayed will become an average of the last continuous values for each data packet within the overall stored sets.

When the stored data set has been inspected the user has the option of deleting the data by selecting the ‘waste basket’ icon, or exiting the data set without deletion (exit icon) in which case further data may be added to the stored set.

Note

If the instrument is switched off, all stored data will be lost.

User Manual Wahl DHS520

Page

8.4 Burst Mode

Burst mode is only intended for use when data logging to an IPAQ or laptop computer.

It can be used for monitoring rapid fluctuations of temperature or recording a temperature profile, such as a long strip of material.

Burst mode requires dual stage trigger operation. With the trigger pulled to the T1 position, the instrument operates as per Classic mode (See Section

8.2). However, note that that in burst mode, the instantaneous readings (only)

are always highlighted on the side screen and displayed internally within 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 2-piece data packet is added, giving the emissivity and window transmission factor values.

Note that when logging to the DA-LOG software, the maximum number of consecutive readings that can be stored in each file is limited to 999 - equating to 30 seconds of Burst mode output.

If the trigger is released back to the T1 position, Classic mode operation is resumed.

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Wahl DHS520

9.0 THERMOMETER OPERATION

User Manual

CAUTION

Never look at the sun through this instrument - this could

cause severe damage to the eye.

When measuring temperatures above 1200°C/2192°F, a dark filter must be fitted to the lens assembly.

Prior to temperature measurement, the thermometer must be set up as dictated by the chosen application.

The setup procedure can be split into 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 / Off

Alarms High Alarm

(enter set-

Low Alarm

Off

point values)

Measurement Setup Units °C / °F / K / °R

Emissivity (0.01 to 1.20)

Averager Time Constant Fast / Mid / Slow

Window Compensation On (0.80 to 1.20) / Off

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Wahl DHS520

User Manual

9.1 Operation (Example 1: simple temperature measurement)

1) Switch the thermometer on via the On/Off switch. The initialization screen will appear and, after a few seconds, the screen will change to show the measurement mode display.

2) Check the battery status, ensure that there is sufficient battery life remaining.

3) Assess the intended target. If the target temperature is likely to be above 1200°C/2192°F, fit the dark window (supplied as a standard accessory). Refer to Section 6.4.

4) If the trigger mode is not already set to Classic Mode, go into Menu Mode, open the Trigger Mode menu and select

Classic Mode

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 Section 6.6), then aim the thermometer at the target and, using the lens focus adjustment (See Section 5.5), focus the reticule onto the area under observation. Check that the reticule is fully filled by the target, re-position if necessary.

11) Press the trigger to start measurement. The main display and eyepiece display are updated with the reading

12) Release the trigger to stop measurement and freeze the last recorded value on the main display.

Page

User Guide

Wahl DHS520

9.2 Operation (Example 2 : complex temperature measurement)

In some industrial applications, a window or viewing port may be situated between the thermometer and the target object. This can lead 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).

Viewing port/window: Glass - typical window compensation factor

(0.920)

Hot target: Mild steel - typical emissivity value (0.35)

315023

Fig. 23 Typical complex temperature measurement application

Page 32

User Guide Wahl DHS520

1) Check the battery status, ensure that there is sufficient battery life remaining

2) Assess the intended target. If the target temperature is likely to be above 1200°C/2192°F, fit the dark window (supplied as a standard accessory)

3) Go into Menu Mode, open the Trigger Mode menu and select Classic

Mode

4) Enter the ‘Emissivity’ value for the material under observation (0.35)

If the window compensation factor of the viewing window/port is known:

5) Set Window Compensation to On.

6) Enter the known compensation factor (0.920)

If the ‘Window Compensation’ factor of the viewing window/port is not known:

7) Take and record a reading with the thermometer of a known temperature value, with the emissivity set to correspond and the Window Compensation factor set to default (i.e. blackbody heat source, emissivity set to 1.00 and Window Compensation 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, as it is correct for the chosen viewing window/ port material (0.920)

10) Ensure that the Alarms function is set to Off.

11) Ensure the Bluetooth option is set to Off (Wahl DHS520B variants only)

12) Select the Continuous temperature measurement option.

13) Aim the thermometer through the viewing window/port at the target and focus the reticule onto the area under observation. Check that the reticule is fully filled by the target, re-position if necessary

14) Press the trigger to start measurement. The main display and eyepiece display are updated with the reading.

15) Release the trigger to stop measurement and freeze the last recorded value on the main display.

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User Manual

Wahl DHS520

10.0 DATA STREAMING

Data streaming provides flexibility in the retention of information captured by the thermometer. It can be used in two separate ways: serially or wireless.

10.1 Serial Communications

To capture information from the Wahl DHS520 to a laptop/PC/Pocket PC, DA-LOG Datalogger Software

must be used.

Note

The ‘Bluetooth’ option must be disabled 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 DHS520/520B.

5) Press the trigger to capture and stream data, release the trigger to stop.

Note

To prolong b atte ry lif e, always disconnect t he seri al communications cable when not in use.

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User Manual

Wahl DHS520

10.2 ‘Bluetooth’ Wireless Comms (Wahl DHS520B variants only)

To capture information by Bluetooth communication from the Wahl DHS520B to a laptop/PC/Pocket PC, you must use DA-LOG Datalogger Software.

1) Ensure that the datalogging software has been loaded to the PC/laptop or Pocket PC 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 the trigger to stop.

Note

To prolong b atte ry lif e, always disconnect t he seri al communications cable when not in use.

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Wahl DHS520

User Manual

11.0 EMISSIVITY

In order to obtain accurate temperature measurements, the emissivity value of the target surface must be known. This section of the User Guide contains typical emissivity values of the most commonly measured materials for each thermometer variant.

Where no emissivity 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 0.30

Silica 0.30

Sillimanite 0.60

Ceramics 0.40

Magnesite -

Fig. 24 Typical Emissivity Values for Refractories

315024

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User Manual Wahl DHS520

11.2 Alloys

Material 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

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Wahl DHS520

User Manual

11.3 Metals

Material

Wahl DHS520/520B

Aluminum

0.13

Oxidized

0.40

Chromium

0.43

Oxidized

0.75

Cobalt

0.32

Oxidized

0.70

Copper

0.06

Oxidized

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

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User Manual Wahl DHS520

11.4 Miscellaneous

Material

Wahl DHS520/520B

Asbestos

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

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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.

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User Manual Wahl DHS520

13.0 ACCESSORIES

13.1 Accessories

Type 110 & Type 135 Close-up Lenses

Type 110 (L-110) and Type 135 (L-135) close-up lenses enable the Wahl DHS520/520B to focus on targets at distances that are too close to measure

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. 28 Type 110 and Type 135 close-up lenses

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User Guide Wahl DHS520

Protective Hard Carry Case

The Hard Carry Case (DA-WPC) is a rugged, lightweight, waterproof and shockproof injection-molded box, 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)

Page

User Manual Wahl DHS520

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Wahl DHS520

User Manual

14 USER CONFIGURATION RECORD

The Wahl DHS520/520B can be configured to suit your measurement requirements. Your chosen parameter settings and values are stored in the thermometer’s memory.

If the thermometer is returned to Palmer 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 these can be re-entered into the thermometer and used again.

Page

User Manual Wahl DHS520

USER CONFIGURATION RECORD

Serial Nº .............................................................

Date: .............................................................

Measurement Mode: Peak



Instantaneous



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



°R



Backlight Setting: Off



Dim



(timer) ....................

Bright



(timer)

....................

Sounder Setting: Off



Window transmission: Off



(value) ....................

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Wahl DHS520

User Manual

APPENDIX

Serial Communications Data Logging Protocol

he logging protocol applies to both the SERIAL PORT and BLUETOOTH module.

UART Settings

BAUD 57600 fixed START DATA PARITY STOP1,8,N,1

Classic Mode stream

When the trigger is pressed to the T1 position, a continuous stream of lines of data 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

= C055

(ii) Packet

Classic – while key pressed

Hold – when key released

(iii) Units

°Celsius

°Fahrenheit

°Rankin

Kelvin

(iv) Mode

Instantaneous

Peak

Valley

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. 0x5F,SP, 0x5F,SP, 0x5F

(vi) Termination 0x0D,0x0A

The IPAQ sends a * handshake to indicate ‘H’ hold – i.e. key released and data logged

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User Manual Wahl DHS520

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Wahl DHS520

User Manual

Advanced Mode - data stream

When the trigger is pressed to the T1 position, a continuous stream of lines of data is produced every 0.5 ±0.1seconds:

B 1 C I +972.0 CR LF

As per Classic Mode stream except

(i) Packet

Advanced mode - trigger 1 pressed

There is no handshaking of the advanced data stream.

Advanced – History mode packet

When the trigger is pressed to the T1 position, a 6 line packet of calculated data is output.

EXAMPLE:

B 2 C

+972.0

B 2 C P +1030 CR LF B 2 C V

+812.0

CR LF

B 2 C A

+900.0

CR 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

Advanced – History mode packet

(ii) Mode

Emissivity

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 lines of data is output every 30 ±5ms. Example:

B 3 C I +972.0 CR LF

As above except:

(i) Packet

Advanced - Burst mode packet

When T2 is released in burst mode, a 2-line termination packet is output:

B 3 C E +1.000 CR

{ B 3 C T +1.000 CR LF

or if disabled

{ B 3 C T + OFF CR LF

The IPAQ should send a * handshake to indicate termination packet reception.

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Wahl DHS520

User Manual

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.

Wahl Heat Spy DHS520, Heat Spy DHS520B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual