General DT8852, DT8855, DT8856 User Manual

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DIGITAL THERMOCOUPLE

THERMOMETERS

USER’S MANUAL

Please read this manual carefully and thoroughly before using this product.

DT8852

Dual input; compatible with

types “K”, “J” and “T” thermocouples

DT8855

Single input; compatible with

types “K”, “J”, “T”, “R”, “S” and “E” thermocouples

DT8856

Dual input; compatible with

types “K”, “J”, “T”, “R”, “S” and “E” thermocouples

Visit us at www.TestEquipmentDepot.com

99 Washington Street Melrose, MA 02176

Phone 781-665-1400 Toll Free 1-800-517-8431

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TABLE OF CONTENTS

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Key Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 –3

What’s in the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 –5

Setup Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 –7

Select Thermocouple Type . . . . . . . . . . . . . . . . . . . 6

Install Thermocouple(s) . . . . . . . . . . . . . . . . . . 6 –7

Operating Instructions. . . . . . . . . . . . . . . . . . . . . . . . 7 – 10

Monitoring Temperatures in Real Time. . . . . . . 7 –8

Making Relative Measurements. . . . . . . . . . . . . . . 8

Recording Min/Max Temperatures . . . . . . . . . . 8 –9

PC-assisted Data Logging . . . . . . . . . . . . . . . 9 – 10

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operating & Maintenance Tips . . . . . . . . . . . . . . . . . . . . 11

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . . . . 12

Manuel de L'Utilisateur. . . . . . . . . . . . . . . . . . . . . . 13 – 24

Manual del Usuario . . . . . . . . . . . . . . . . . . . . . . . . . 25 – 36

INTRODUCTION

Thank you for purchasing General Tools & Instruments’ DT8852, DT8855 or DT8856 Digital Thermocouple Thermometer. Please read this user’s manual carefully and thoroughly before using the instrument.

All three models are designed for precision temperature measurement. They are also available for purchase with a National Institute of Standards and Technology (NIST)-traceable calibration certificate.

KEY FEATURES

• Min/Max memory with relative time stamp

• Data hold

• Large backlit LCD with dual temperature readouts and relative time stamp readout

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• Calculates and displays T1-T2 (DT8852 and DT8856 only)

• °C/°F and data hold buttons

• RS-232 output jack; optional PC data logging kit includes RS-232 to USB adapter

• 20-minute Auto Power Off (can be disabled for data logging)

• 1 year limited warranty

WHAT’S IN THE CASE

All three models come in a custom hard carrying case with a “9V” battery and this user’s manual. The DT8852 and DT8856 each come with two general-purpose “K” type bead thermocouple probes with a measurement range of -58° to 392°F (-50° to 200°C). The DT8855 comes with one “K” type probe with the same range.

A variety of other “K” type thermocouple probes with different sensor types, form factors and temperature ranges are available from General. Visit www.generaltools.com and enter “K type probe” in the SEARCH box. The following optional accessories are also available for the DT8852, DT8855 and DT8856: ASFTKIT (PC Data Logging Kit) and Z110VADPT (9V AC/DC adapter)

PRODUCT OVERVIEW

Figure 1 on p. 4 shows all of the controls, indicators and physical features of the DT8852 and DT8856. The descriptions of Callouts A and I detail the two differences between those dual-input models and the single-input DT8855. Figure 2 on p. 5 shows all possible indications on the LCD. Familiarize yourself with the positions and functions of all controls, indicators and physical features before moving on to the Setup Instructions and Operating Instructions.

A. Two spade-lug thermocouple probes plugged into T1 (left) and T2

(right) jacks (DT8852 and DT8856 only; DT8855 has only one (T1)

jack on left) B. LCD C.

RS232

jack (on side)

REC

button:

•

Pressed briefly with unit in real-time mode

Record mode.

, begins operation in

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•

Pressed once briefly in Record mode

, switches primary temperature display to show maximum temperature recorded since entering Record mode.

Pressed twice briefly in Record

•

mode

switches primary display to

Fig. 1

show minimum temperature recorded since entering Record mode.

•

Pressed a third time briefly in Record

mode

, resumes showing real-time temperature sensed by T1 input on primary display without exiting Record mode.

Pressed and held with unit in Record

• , exits operation in Record mode

mode

and resumes operation in real-time mode.

• Also used with ,

REC

and

buttons to select thermocouple type.

DC9V °C/°F

jack (on side) button:

E. F.

°C/°F

• Toggles between Celsius and Fahrenheit temperature units.

• Also used to select thermocouple type. G. button. Pressed briefly, turns LCD backlight on for 30 seconds. H. Battery compartment cover (opens from back)

CHANNEL

• Pressing

button (DT8852 and DT8856):

CHANNEL

button once switches primary display to show

value of T2 input and secondary display to show value of T1 input.

•

Pressing button again

switches primary display to show difference between T1 and T2 inputs (T1-T2) and causes secondary display to toggle between T1 and T2 readings.

•

Pressing button again

resumes normal display (T1 on primary display and T2 on secondary display).

TIMER

button (DT8855). Pressed briefly, starts relative time clock for

use as measurement reference.

REL/HOLD

•

Pressed briefly

button:

, “freezes” primary temperature readout with T1 reading while allowing secondary readout to continue updating with real-time T2 value.

C D

E F

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•

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Pressed and held

baseline of subsequent T1 readings until

, makes T1 input value at that moment the

REL/HOLD

button is

pressed again.

• Also used with button to disable Auto Power Off function.

K. button:

Pressed briefly

•

, powers thermometer on and off.

• With thermometer off, pressing button briefly at same time as

REL/HOLD

button powers unit on and disables 20-minute Auto

Power Off function.

• With thermometer off, pressing button at same time as button enables selection of thermocouple type.

Fig. 2. All possible display indications

REC

. Indicates operation in

Record mode

MAX

and

MIN

. Indicates that primary temperature readout is showing maximum or minimum temperature sensed since entering Record mode

HOLD

and

REL. HOLD

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indicates that primary display is “frozen” at selected past value of T1 input.

REL

indicates that reading on primary display represents difference between value of real-time T1 input and value of T1 input when

REL

button was pressed.

BAT

. Indicates that battery is low on charge and should be replaced

°C and °F

T1-T2

6. between values of T1 and T2 inputs.

. Indicates selected temperature unit

. Indicates that primary display is showing difference

and T2at right of secondary display indicate which value is shown on secondary display.

7. Primary temperature readout

K, J, T, R, S, E

. Indicates selected thermocouple type

9. Secondary temperature readout

10. Relative clock readout

REC

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SETUP INSTRUCTIONS

SELECT THERMOCOUPLE TYPE

Before plugging any thermocouples into the jacks on the top of the thermometer, you must ensure that the instrument is configured for the type of thermocouple to be used. DT8852 and DT8856 users: You cannot plug two different types of thermocouple into the jacks. You must use two probes of the same type.

By default, the DT8852/8855/8856 has been configured to work with “K” type thermocouples. If you plan to use only “K” type thermocouples, skip ahead to the “Install Thermocouple(s)” section below.

If you plan to use type “J”, “T”, “R”, “S” or “E”.thermocouples, use the following procedure to configure the thermometer for the selected type.

REC

1) With the thermometer powered off, press and hold the while pressing the button. The letter “K” will appear on the left side of the LCD.

°C/°F

2) Press the

button as many times as necessary to change “K” to the letter of the thermocouple type that you plan to use. For the DT8852, the “other” options are “J” and “T”. For the DT8855 and DT8856, the “other” options are “J”, “T”, “R”, “S” and “E”.

3) Press the

REC

button to save your selection. A large letter “S” will appear in the center of the LCD for a few seconds. The thermometer will then power on, with the letter corresponding to your selected thermocouple type on the left side of the LCD and one set (DT8855) or two sets (DT8852 and DT8856) of four dashes on the primary and secondary readouts.

INSTALL THERMOCOUPLE(S)

Using the photo on the right as

BACK OF INSTRUMENT

a guide, plug one (DT8855) or two (DT8852 or DT8856)

thermocouples of the selected type into the T1 jack (DT8855) or T1 and T2 jacks (DT8852 and DT8856) on the top of the thermometer. On spade-lug

FRONT OF INSTRUMENT

thermocouple probes, the narrower lug is the positive (+) terminal and the wider lug is the negative (-) terminal.

button

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DT8852 and DT8856 users: If you insert only one thermocouple into the T1 or T2 port, the readout corresponding to the unused port will show four dashes (see figure below).

OPERATING INSTRUCTIONS

MONITORING TEMPERATURE(S) IN REAL TIME

To measure temperatures sensed by installed thermocouples

the button to power on the unit. The T1 temperature will appear on the primary readout (all three models). The T2 temperature (DT8852 and DT8856 only) will appear on the secondary readout. This is the “normal” display mode.

To swap the readouts

T2 is shown on the primary readout), press the (DT8852 and DT8856 only). This is the “swap” display mode.

To show T1-T2 on the primary readout

T1 and T2 on the secondary readout, press the (DT8852 and DT8856 only). This is the “T1-T2” display mode.

To resume showing T1 on the primary readout and T2 on the secondary readout, press the DT8856 only).

When the thermometer is powered on, it will resume operation in the same Channel mode—normal, swap, or T1-T2—that it was in when it was powered off.

To hold a T1 reading REL/HOLD

continue to be updated on the secondary readout (DT8852 and DT8856 only). To release the hold and resume showing real-time T1 values on the primary readout, briefly press the again.

On the single-input DT8855, the button at the lower left of the front panel is labeled button starts a running clock with 1-second resolution in the lower

button. While the T1 reading is held, the T2 reading will

(so T1 is shown on the secondary readout and

CHANNEL

and alternating temperatures

CHANNEL

(“freeze” the primary readout), briefly press the

TIMER

, rather than

button again (DT8852 and

REL/HOLD

CHANNEL

. Pressing the

, press

button once

button again

button

TIMER

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right corner of the LCD. This clock can serve as a relative time reference for temperature measurements.

MAKING RELATIVE MEASUREMENTS

To track changes in T1 temperature over time relative to a T1 temperature at a particular time, press and hold the

REL/HOLD

button at that time. In Rel mode, the primary readout will show the difference between the real-time temperature sensed by the T1 thermocouple and the T1 temperature when Rel mode was entered.

For example, if the value of T1 is 25°C when Rel mode is entered and the temperature later rises to 30°C, the primary readout will show 5°C (30 – 25), accompanied by the term

REL

on the top line of the LCD. If the temperature then falls to 20°C, the primary readout will show -5°C (20 – 25).

In Rel mode, the secondary readout will continue to show the real-time temperature sensed by the T2 thermocouple (DT8852 and DT8856 only). To exit Rel mode and resume showing T1 on the primary readout and T2 on the secondary readout, press and hold the

To select a temperature unit (Fahrenheit or Celsius), use the

REL/HOLD

button again.

°C/°F

button. The selected unit will appear at the right of the primary readout.

To turn on the display backlight for 30 seconds, press the button.

RECORDING MIN/MAX TEMPERATURES

In Record mode, the DT8852, DT8855 and DT8856 continuously track the maximum and minimum temperatures (Max and Min) sensed through the T1 port. The instrument also notes the time at which each temperature occurred. The two times are not referenced to an absolute clock (as in a conventional time stamp), but rather to the time at which Record mode was entered. The recorded times at which Max and Min occurred can be considered relative time stamps.

To enter Record mode

, briefly press the

REC

button. The values on the primary and secondary readouts will not change, and will continue to track the T1 (all three models) and T2 (DT8852 and DT8856 only) temperatures. However, pressing the

REC

to appear in the upper left corner of the LCD and 2) starts a

REC

button 1) causes the term

running clock with 1-second resolution in the lower right corner of the LCD. In Record mode, all front-panel buttons except the and buttons are disabled.

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Once Record mode has been entered, one brief press of the

REC

button switches the primary readout to show the highest temperature

MAX

recorded since entering Record mode, along with the term

above it. The relative time at which this maximum temperature occurred is indicated by the time shown in the lower right corner. The secondary readout will continue to show the real-time temperature sensed by the T2 thermocouple (DT8852 and DT8856 only).

A second brief press of the

REC

button switches the primary readout to show the lowest temperature recorded since entering Record mode, along with the term

MIN

above it. The relative time at which this minimum temperature occurred is indicated by the time shown in the lower right corner. As before, the secondary readout will continue to show the real-time temperature sensed by the T2 thermocouple (DT8852 and DT8856 only).

A third press of the

REC

button releases the primary readout to resume showing the real-time T1 temperature, with the secondary readout continuing to show T2 (DT8852 and DT8856 only). The relative time clock will continue to run and indicate how long it has been since Record mode was entered.

To exit Record mode, stop the relative clock, and resume “normal” display mode—with T1 shown on the primary readout and T2 on the secondary readout (DT8852 and DT8856 only)—press and hold the

REC

button for at least 3 seconds.

PC-ASSISTED DATA LOGGING

Although the DT8852, DT8855 and DT8856 lack internal memory, they can be used as data logging instruments (in order to make multiple temperature measurements over time at a user-specified sampling rate) by connecting them to a PC via an optional hardware/software package. The package, designated ASFTKIT, comprises an RS-232 to USB converter/cable and a mini-disc containing PC interface/data logging software.

ASFTKIT includes a user’s manual with instructions for connecting the DT8852, DT8855 and DT8856 to a PC through the instrument’s RS-232 port (Fig. 1, Callout C). The manual also includes complete instructions for setting data logging parameters such as sampling time. Although the software was written before the debut of Windows7, it works well with that operating system and its recent predecessors. The only change that you may have to make to use the

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data logging package is to renumber the COM ports that represent your PC’s USB jacks; the application can only stream data to COM ports assigned a number between 1 and 4.

To enable long-term data logging, you must disable the thermometer’s Auto Power Off (APO) feature. If you do not, the instrument will automatically power off after 20 minutes of front-panel inactivity.

disable APO

the following special way: Press and hold the

, power the thermometer off and then power it back on in

REL/HOLD

button before

pressing the button. Doing so will cause a large, lower-case “n” to appear on the LCD. Two seconds later, the “n” will disappear and the instrument will power on normally—but with the APO function disabled. There is no display indication of APO status (whether the function is enabled or disabled).

SPECIFICATIONS

Maximum Measurement Ranges

-328° to 2498°F (-200° to 1370°C) with “K” type thermocouple(s)

-328° to 1400°F (-200° to 760°C) with “J” type thermocouple(s)

-328° to 734°F (-200° to 390°C) with “T” type thermocouple(s) 32° to 1832°F (0° to 1000°C) with “R” type thermocouple(s) 32° to 3200°F (0° to 1760°C) with “S” type thermocouple(s)

-328° to 1357°F (-200° to 736°C) with “E” type thermocouple(s)

Measurement Accuracies (from 64° to 82°F)

±(0.1% of reading + 1.4°F (0.7°C)) with “K”, “J”, “T” and “E” type

thermocouple(s)

±(0.3% of reading + 1.4°F (0.7°C)) with “R” and “S” type

thermocouple(s)

Measurement Resolution

0.1° (F or C) below 1000°; 1° (F or C) above 1000°

Measurement Range of Included Thermocouple(s)

-58° to 392°F (-50° to 200°C) Auto Power Off Trigger 20 minutes of front-panel inactivity Operating Temperature 32° to 122°F (0° to 50°C) @<85% RH Dimensions 7.16 x 2.83 x 1.18 in. (182 x 72 x 30mm) Weight 7.8 oz. (220g) Power Source One “9V” battery (included)

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OPERATING & MAINTENANCE TIPS

When

BAT

appears at the upper right of the LCD, it’s time to replace the “9V” battery that powers the thermometer (although measurements will remain valid for several hours after the icon first appears).

After subjecting the thermometer to a large change in ambient temperature, wait at least 30 minutes before making measurements to guarantee the accuracy of readings.

Remove the battery when storing the unit or when you do not expect to use it for an extended period of time (months rather than weeks).

Do not disassemble the thermometer or immerse it in water. Doing so voids the 1-year limited warranty.

WARRANTY INFORMATION

General Tools & Instruments’ (General’s) DT8852, DT8855 or DT8856 Digital Thermocouple Thermometer is warranted to the original purchaser to be free from defects in material and workmanship for a period of one year. Subject to certain restrictions, General will repair or replace this instrument if, after examination, the company determines it to be defective in material or workmanship. The warranty period begins on the date of purchase. You are encouraged to register your product online. General will extend your warranty an additional 60 days if you register at www.generaltools.com/Product Registry.

This warranty does not apply to damages that General determines to be from an attempted repair by nonauthorized personnel or misuse, alterations, normal wear and tear, or accidental damage. The defective unit must be returned to General Tools & Instruments or to a Generalauthorized service center, freight prepaid and insured.

Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product. In no event shall General be liable for any incidental, special, consequential or punitive damages, or for any cost, attorneys’ fees, expenses, or losses alleged to be a consequence of damage due to failure of, or defect in any product including, but not limited to, any claims for loss of profits.

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RETURN FOR REPAIR POLICY

Every effort has been made to provide you with a reliable product of superior quality. However, in the event your instrument requires repair, please contact our Customer Service to obtain an RGA (Return Goods Authorization) number before forwarding the unit via prepaid freight to the attention of our Service Center at this address:

Remember to include a copy of your proof of purchase, your return address, and your phone number and/or e-mail address.

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99 Washington Street Melrose, MA 02176

Phone 781-665-1400 Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Speciﬁcations subject to change without notice

NOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS.

MAN# DT8852, DT8855, DT8856-condensed

7/31/13