General Tools DT4947SD User Manual

DT4947SD

USER’S MANUAL

4-CHANNEL THERMOMETER

WITH DATALOGGING SD CARD

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

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Operating Instructions . . . . . . . . . . . . . . . . . . . . . 4 – 11

What’s in the case . . . . . . . . . . . . . . . . . . . . 4 –5

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

Adjusting Probe Offsets . . . . . . . . . . . . . . . . . . . 8

Normal Operation . . . . . . . . . . . . . . . . . . . . . 8 –9

Holding and Storing Measurements. . . . . . . . . . 9

Automatic vs. Manual Datalogging . . . . . . 9 – 10

Transferring Data from the SD Card

to a Computer . . . . . . . . . . . . . . . . . . . . . . 10 – 11

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Maintenance Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Optional Accessories. . . . . . . . . . . . . . . . . . . . . . . . . 13

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . 13

Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . 14

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INTRODUCTION

Thank you for purchasing General Tools & Instruments’ DT4947SD 4-Channel Thermometer
with Datalogging SD Card. Please read this user’s manual carefully and thoroughly before
using the instrument.

The DT4947SD is a general-purpose handheld instrument that can measure up to four
channels of temperature with 0.4% accuracy using either of two kinds of optional
accessories: thermocouples or Pt 100 ohm probes (resistance-temperature detectors, or
RTDs). RTDs are slowly replacing thermocouples in many industrial applications below
1100ºF (600ºC) due to their superior accuracy and repeatability. When used as inputs to the
DT4947SD, Pt 100 ohm probes can measure and display temperatures from -328º to
1562ºF (-200º to 850ºC).

Although thermocouples are not as accurate as other types of thermometers, they more
than make up for this shortcoming with an extended measurement range. For example,
the DT4947SD can measure and read out temperatures from -148º to 2372ºF
(-100º to 1300ºC) using Type K thermocouples, and temperatures from -148º to 2192ºF
(-100º to 1200ºC) using Type J thermocouples. Type R and Type S thermocouples have an
even higher upper limit. These very wide ranges, plus a fast response time and a low price
tag, suit thermocouple thermometers for a variety of commercial and industrial tasks
requiring measurement of very high and low temperatures. Examples include applications
in the food and chemical processing industries, HVAC (heating, ventilation and air­conditioning), power generation and paper production.

Because it is microprocessor-based, the DT4947SD can make full use of the portability,
reliability and large storage capacities that SD memory cards offer. Measurements can be
made automatically at any sampling rate between one second and one hour. After time­stamping and storing the measurements on an SD card plugged into the instrument (a
process called datalogging), the user can remove the card and plug it into to a laptop or
desktop computer either directly or through an SD card reader. The data logs are stored on
the card as files with the .xls extension, which can be opened by Microsoft’s Excel
application.

The DT4947SD has a backlit 2-1/2 in. diagonal display and is powered by six “AA” Alkaline
batteries or an optional 9-VDC AC adapter.

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KEY FEATURES

• Four independent temperature measurement channels

• Also measures T1-T2 difference between two channels

• Works with and automatically temperature-compensates for six popular
thermocouple types: K, J, T, E, S and R

• Combining thermocouple types extends overall measurement range to

-148° to 3092°F (-100° to 1700°C)

• Big (2.5 in. diagonal) front-panel green backlit LCD is easy to read

• Displays maximum and minimum readings and holds any reading

• Automatically logs measurements at sampling time settable from one second
to one hour

• Also supports manual datalogging and changing of SD card storage location

• Outputs Excel-compatible data logs

• Accepts SD memory cards of up to 16 GB capacity

• Auto power off function

• Powered by six “AA” batteries or optional 9V AC/DC adapter

OPERATING INSTRUCTIONS

WHAT’S IN THE CASE

The DT4947SD comes fully assembled in a carrying case along with two Type K
thermocouples, a 2 GB SD memory card and this user’s manual.

Optional accessories available from General Tools & Instruments include:

• Pt 100 ohm resistance-temperature detector (RTD) probes

• Types K, J, T, E, R and S thermocouples

• A 9VDC adapter for a 110V power supply

Figure 1 shows all of the controls and indicators on the front, right side, back, top and
bottom of the DT4947SD. Familiarize yourself with the positions and functions of these
controls, indicators and connectors before moving on to the setup procedure.

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FRONT

TOP

BOTTOM

RIGHT

SIDE

BACK

Fig. 1. The DT4947SD’s controls and indicators and other physical features

1-1 Liquid-crystal display
1-2 POWER/ESC button
1-3 HOLD/NEXT button
1-4 REC/ENTER button
1-5 Type ▲ button
1-6 T1-T2 ▼ button
1-7 SET button
1-8 LOGGER OFFSET button

1-11 PT2 input jack
1-12 RS-232 output jack
1-13 Socket for 9VDC AC adapter
1-14 Tripod attachment nut
1-15 Battery compartment cover screws
1-16 Battery compartment cover
1-17 Kickstand

1-18 SD card socket
1-9 T1 through T4 thermocouple jacks
1-10 PT1 input jack

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