DIGI-SENSE DIGI-SENSE 20250-41 Manual

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Melrose, MA 02176

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Toll Free 1-800-517-8431

User Manual

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Temperature and Temperature/RH
Data Loggers with USB Interface

Models 20250-41, -42, -43, -44

THE STANDARD IN PRECISION MEASUREMENT

Introduction

The Digi-Sense USB Data Logger measures ambient temperature and records up to
32,000 readings). Models 20250-42 and 20250-43 also measure relative humidity. Program
sampling rate, high/low alarm levels, and start mode using the provided software. Download
logged data via the integrated USB interface for analysis, graphing, and documentation.
Careful use of this instrument will provide years of reliable service.

Unpacking

Check individual parts against the list of items below. If anything is missing or
damaged, please contact Cole-Parmer immediately.

1. Data logger

2. Clear USB connector cover

3. Type K thermocouple (model 20250-44)

4. Mounting clip with screws

5. Software CD

6. One 3.6 V battery

7. User manual

Key Features

• Status indication via green and yellow/red LEDs

•

Integrated USB interface for setup and data download

User-settable high/low alarms

•

•

Real-time mode—lets you monitor and log measured data in real time
while the logger is still plugged into the computer’s USB interface

Logger Description

1. Clear USB connector cover

2. USB interface to PC port

3. Manual START button

4. Access to battery

5. Internal sensor
(models 20250-41, -42, -43)

6. Input for external type K
thermocouple sensor
(model 20250-44)

7. Record LED (green)

8. Alarm LED (yellow/red)

9. LCD (model 20250-43)

10. Mounting clip

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3

4

5

6

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Setup and Operation

1. Insert the software CD into the PC. Double click the set up.exe file to launch the software

installation program.

2. Follow the installation wizard to complete installation; when complete, the “Datalogger”

software icon shortcut will be automatically placed on the PC desktop.

3. Plug the data logger into the computer USB port and double click on the “Datalogger”

software icon to launch the software.

4. Left click on the “Datalogger Setup” icon (tool image) in the top left corner to open

the “Setting” tab.

Manual start mode: Allows you to move logger to a remote location. T

o start recording,
press and hold the Start button for 3 seconds until the green LED lights up. To stop
recording, press and hold the Start button for 6 seconds until the red LED lights up.

Instant start mode: Recording begins automatically once the logger is removed from

the computer USB port.

5.

Refer to the "Software Setup and Operation" section on pages 4–7 for full instructions.

Note: Model 20250-44 must have the external type K thermocouple sensor connected
before recording.

LED Status Guide

LEDs Indication Action needed

REC ALM

REC ALM

Both LED lights off

– Logging not active —

– No battery inserted or dead battery

‡

Green single flash every 10 seconds*

– Logging in progress, no alarm condition —

Replace battery and download data

Green double flash every 10 seconds*

– Delayed start To start, hold the Start button until

green and yellow LEDs flash

REC ALM

Yellow single flash every 10 seconds*

– Logging in process, LOW alarm condition

†

—

Yellow double flash every 10 seconds*

– Logging in process, HIGH alarm condition

†

—

Yellow single flash every 60 seconds

– Memory is full Download data

REC ALM

*To conserve battery life, increase the LED flashing cycle to 30 seconds using the provided software.
†

The LED status indication alternates every cycle. For example: If there is one alarm, the REC LED blinks
for one cycle and ALM LED will blink for next cycle.
‡

When the battery is low, all operations will be disabled automatically (logged data will be retained).
Replace the battery and use provided software to restart logging operation and to download logged data.

Red single flash every 60 seconds

– Low battery

‡

Replace battery and download data

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