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 . . . . . . . . . . . . . . . . . . . . .
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).
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.
TOP FRONT BOTTOM RIGHT SIDE BACK Fig. 1.
SETUP 1. Choose the power source. Before using the DT4947SD, make sure it is powered by fresh batteries or an optional 9VDC AC adapter plugged into the bottom jack on its right side (callout 1-13). To remove the battery compartment cover (callout 1-16), remove the two screws holding it in place (callout 1-15). Then install six “AA” batteries in the correct orientation, using the polarity marks on the inside of the compartment as a guide. Replace the cover by replacing the two screws. 2. Install an SD card.
5. Enable or disable auto power off. Once the format of decimal point divisions has been set and stored, the display will show the word “yES’ over the term “PoFF”. Press the Type ▲ or T1-T2 ▼ button until the desired automatic power off management scheme (“yES” for enable; “no” for disable) is displayed. Press the REC/ENTER button to store the selection. If enabled, the power off function shuts off the DT4947SD after a period of inactivity of ten minutes. 6. Enable or disable the beeper.
ADJUSTING PROBE OFFSETS To maximize the accuracy of measurements, General strongly recommends that you compensate for (offset) the small measurement error peculiar to each thermocouple and RTD used with the instrument. 1. To adjust the offset of a thermocouple, press the Type ▲ button until the thermocouple’s type appears on the display. Then plug the thermocouple into the T1 jack on the top of the thermometer. Press the LOGGER OFFSET button, hold it for at least three seconds, and then release the button.
3. To use Type J, T, E, R or S thermocouples to measure up to four channels of temperature, first press the Type ▲ button as many times as necessary until the letter of the thermocouple type you are using appears on the display. Then plug one to four of the optional accessories into the jacks on the top of the thermometer. As with Type K thermocouples, display readings are instantaneous. 4.
1. To start automatic datalogging, press the REC/ENTER button once. The top line of the display will then show the term “REC”. Pressing the LOGGER OFFSET button at this point will make REC flash and add the flashing term “LOGGER” at the top right of the display. This indicates that the instrument is currently storing measured values and their time stamps in memory. 2.
Fig. 2. Typical Excel data-only screen Fig. 3.
SPECIFICATIONS Embedded microcontroller Custom one-chip LSI device Display type Liquid-crystal with green backlight Display size 2.05 x 1.5 in. (52 x 38mm) Parameter measured Temperature (in ºF or ºC) Measurement range For Pt 100 ohm probes: -327º to 1562ºF; for thermocouples, depends on type Measurement accuracy For Pt 100 ohm probes: ± (0.4% of reading + 1.8ºF) from -327º to 999.9ºF, ± (0.4% of reading + 2.0ºF) from 1000º to 1562ºF); for thermocouples: ± (0.4% of reading + 2.
MAINTENANCE TIPS Keep your probes and thermocouples clean. When the icon appears in the left corner of the display, it’s time to replace the six “AA” batteries that power the thermometer (although measurements will remain valid for several hours after the low-battery indicator first appears). Replacing the batteries requires removing the two screws that hold the battery compartment cover in place, as explained in Step 1 of the setup procedure on page 6.
RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality.
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GENERAL TOOLS & INSTRUMENTS 80 White Street New York, NY 10013-3567 PHONE (212) 431-6100 FAX (212) 431-6499 TOLL FREE (800) 697-8665 e-mail: sales@generaltools.com www.generaltools.com DT4947SD User’s Manual Specifications subject to change without notice ©2010 GENERAL TOOLS & INSTRUMENTS NOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS.
