Extech Instruments 42280-NIST Manuel utilisateur

User Guide

Temperature and Humidity Datalogger

Model 42280

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Introduction

Congratulations on your purchase of the Extech 42280 Thermometer and Relative Humidity

Datalogger. The 42280 is a wall-mount, tripod mount, or desktop indoor air quality monitor with an

internal memory capable of storing 16,000 readings (8000 temperature readings and 8000 relative

humidity readings) that can later be transferred to PC using the USB interface. This meter is

shipped fully tested and calibrated and, with proper use, will provide years of reliable service.

Material list

Supplied Materials

Meter

User Guide

USB cable

Program CD

Four (4) batteries; 1.5V ‘AA’

9V adaptor

Optional accessories

Calibration bottles (33% and 75%) for Relative Humidity Calibration (RH300-CAL)

Features

Large LCD display shows temperature, humidity, and date/time clock simultaneously

16,000 internal memory capacity (8000 temperature; 8000 RH%)

Visual and Audible (with 117V AC adaptor only) Alarms

Easily configure datalogger through the keypad or via PC interface

USB PC interface with WindowsTM software

Wall mount, tripod mount, or for desktop use

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Description

Meter Description

1. Humidity Sensor (internal Temperature sensor)

2. Audible alarm (with AC adaptor power only)

3. Visual Alarm LED

4. Relative Humidity display

5. Date and Time display

6. Temperature display

7. RECORD status LED

8. USB port

9. AC Adaptor jack

10. Datalogger START-STOP button

11. MODE button

12. SET button

13. Up Arrow button

14. Down Arrow button

15. Tripod mount jack

Notes: The battery compartment is located on rear of instrument. Desktop stand footers are not

shown in diagram.

LCD Display Description

1. Temperature Display

2. Dew Point icon

3. Datalogger icon

4. Date and Time

5. Humidity Display

6. Low battery icon

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Operation

Important Note before starting

This meter relies on firm button presses to operate correctly. Be sure to press firmly and hold the

button for as long as directed in the instructions.

Meter Power

1. The meter is powered by four (4) ‘AA’ 1.5V batteries or the 117V AC adaptor.

2. When the batteries are installed or the adaptor is connected to an AC power source,

momentarily press the START-STOP button to turn the meter ON.

3. Press the START-STOP button again to turn the meter OFF.

Viewing the displayed readings

1. Normally, the top line indicates temperature in degrees C or F. Use the MODE button to switch

between degrees C and degrees F.

2. Press and hold the MODE for at least 2 seconds. This will change the top display to Dew Point

temperature. The ‘DP’ icon will appear on the LCD when in Dew Point mode. Press and hold the

MODE button for at least 2 seconds to return the top display to the normal temperature display

mode.

3. The middle line displays Relative Humidity in %.

4. The bottom line automatically alternates between Time and Date displays.

5. If the ALM status LED illuminates and the display flashes, one of the Alarm limits has been

reached. Program the High and Low Temperature/Humidity limits in Programming parameter P5

(detailed later in this user guide).

Datalogger Basics

The Model 42280 has a built-in Datalogger that can store up to 8000 temperature and 8000

humidity readings. Readings can be stored in the meter and transferred at a later time to a PC.

The meter must be configured before datalogging can be attempted. Parameters such as Real Time

Clock and Datalogger Sample Rate must be programmed before datalogging can begin. It is

strongly recommended that the user take advantage of the supplied software to configure the meter.

Instructions for manually configuring the meter are provided below; however configuring the meter

via software is very convenient.

Basic instructions for connecting the meter to a PC and getting started with the supplied software

are provided later in this guide. Detailed instructions regarding the supplied software are provided in

a separate manual included on the supplied CD-ROM and the HELP utility in the software program.

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Manual Programming

The Model 42280 has several programming modes (P1, P2, P3, P4, P5, and P6). These

parameters must be programmed before the Datalogger or the Alarm can be used.

List of Programming Modes

P1 - Number of samples to record (1, 2, 4, 8, 12, or 16 x 1000; 1=1000, 2=2000, etc.)

P2 - Datalogging Start Methods (Immediate, Keypad, Scheduled, and Repeat modes)

P3 – Start Time (set the time and date when Datalogging will automatically begin); Note that P3

will not appear in the menu if ‘SCh’ is not selected in P2.

P4 - Sample Rate (set the datalogging interval from 1 second up to 12 hours)

P5 - Alarm Mode (set High and Low Temperature/Humidity limits)

P6 - Real Time Clock (set the meter’s internal date and time clock)

Programming Mode P1; Number of readings (sample points) to record

1. Press the SET button to access the setup mode

2. Use the arrow buttons to select parameter P1 (see sample display below)

3. Press the SET button again

4. Use the up/down arrow buttons to select the

desired number of samples (in thousands) to record

for a datalogging session (1, 2, 4, 8, 12, or 16;

where 1=1000, 2=2000, 4=4000, and so on)

5. Press the SET button to save setting

6. Use the arrow buttons to select another programming mode or press MODE to exit the

programming mode.

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Programming Mode P2; Datalogger Start Modes

1. Press the SET button to access the setup mode

2. Use the arrow buttons to select parameter P2

3. Press the SET button again

4. Select one of the four Start modes using the up/down arrow buttons (see list and diagram

below)

a. rEp (Repeat Start mode): Logger starts

once readings are downloaded to PC

b. hEy (Keypad Start): Datalogging begins

after the START/STOP button is held for

2 seconds

c. imm (Immediate Start): Recording starts

immediately after exiting the setup mode

d. SCh (Scheduled Start): Logging begins

at a preset date and time

5. Press the SET button to save the setting

6. Use the arrow buttons to select another

programming mode or press MODE to exit the

programming mode.

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Programming Mode P3; Datalog Start Time

Note that parameter P3 will only be visible if the Start MODE is set to SHCEDULE (Parameter P2

set to ‘SCh’).

1. Press the SET button to access the setup

mode

2. Use the arrow buttons to select parameter P3

3. Press the SET button again

4. Use the up/down arrow buttons to set the year

5. Press the SET button again

6. Use the up/down arrow buttons to set month

7. Press the SET button again

8. Use the up/down arrow buttons to set the day

9. Press the SET button again

10. Use up/down buttons to set the hours

11. Press the SET button again

12. Use up/down buttons to set the minutes

13. Press the SET button again

14. Use the up/down arrow buttons to set the

seconds

15. Press the SET button again to store the settings

16. Press the MODE button to back out to the top level of this menu.

17. Use the arrow buttons to select another programming mode or press MODE to exit the

programming mode.

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Programming Mode P4; Datalogger Sample Rate

1. Press the SET button to access the setup mode

2. Use the arrow buttons to select parameter P4

3. Press the SET button again

4. Use the up/down arrow buttons to set hours

5. Press the SET button again

6. Use the up/down arrow buttons to set the minutes

7. Press the SET button again

8. Use the up/down arrow buttons to set the seconds

9. Press SET again to store the settings

10. Press the MODE button to back out to the top level of this menu.

11. Use the arrow buttons to select another programming mode or press MODE to exit the

programming mode.

Programming Mode P5; High and Low Alarms

1. Press the SET button to access the

setup mode

2. Use the arrow buttons to select

parameter P5

3. Press the SET button again

4. Use the up/down arrow buttons to set the

High Temperature Alarm limit

5. Press the SET button again

6. Use the up/down arrow buttons to set the

Low Temperature Alarm limit

7. Press the SET button again

8. Use the up/down arrow buttons to set the High Humidity Limit

9. Press the SET button again

10. Use the up/down arrow buttons to set the Low Humidity Limit

11. Press the SET button again to store the settings

12. Press the MODE button to back out to the top level of this menu.

13. Use the arrow buttons to select another programming mode or press MODE to exit the

programming mode.

Note: The AC Adaptor must be used for the audible alarm to sound

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Programming Mode P6; Real Time Clock

1. Press the SET button to access the setup mode

2. Use the arrow buttons to select parameter P6

3. Press the SET button again

4. Use the up/down arrow buttons to set the year

5. Press the SET button again

6. Use the up/down arrow buttons to set month

7. Press the SET button again

8. Use the up/down arrow buttons to set the day

9. Press the SET button again

10. Use the up/down arrow buttons to set the hours

11. Press the SET button again

12. Use the up/down arrow buttons to set the minutes

13. Press the SET button again

14. Use the up/down arrow buttons to set the seconds

15. Press SET again to stores the settings

16. Press the MODE button to back out to the top level of this menu.

17. Use the arrow buttons to select another programming mode or press MODE to exit the

programming mode.

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Datalogging

Starting a Datalogging session

The 42280 can automatically store up to 16,000 readings (8000 temperature and 8000 humidity) for

later transfer to PC. Program the controller, as discussed earlier, before Datalogging. If the

Datalogger has not been configured at this point, configure as necessary. If programming is

complete, continue with the next section.

Starting the Datalogger by push-button (Key Mode)

1. Programming mode P2 (Datalogging Start Modes) must be set to KEY (hEy) mode for this

method.

2. When P2 is set to ‘hEy’, press and hold the START-STOP button for 2 seconds.

3. The REC front-panel status light will blink indicating that readings are currently recording at

the rate programmed in parameter P4 (sample rate)

4. To stop recording, press and hold the START-STOP button for at least 2 seconds. The REC

status light will stop blinking.

Starting the Datalogger in Immediate Mode

1. Programming mode P2 (Datalogging Start Modes) must be set to ‘Imm’ mode for this method.

2. When the programming mode is exited, Datalogger automatically begins.

3. The REC front-panel status light will blink indicating that readings are currently recording.

4. To stop recording, press and hold the START-STOP button for at least 2 seconds. The REC

status light will stop blinking.

Starting the Datalogger in Schedule Mode

1. In Schedule Mode the meter begins recording at a specific date and time, as programmed by

the user.

2. Programming mode P2 (Datalogging Start Modes) must be set to ‘SCh’ mode for this method.

3. After setting P2 to ‘SCh’, set the desired time and date in Programming Mode P3 (P3 only

appears in the menu when ‘SCh’ is selected in P2.

4. Datalogging will start at the programmed date and time. Note that the Real Time Clock

(Programming Mode P6) must first be set to the current date and time.

5. When datalogging begins, the REC front-panel status light will blink indicating that readings

are currently recording at the rate programmed in parameter P4 (sample rate)

6. To stop recording, press and hold the START-STOP button for at least 2 seconds. The REC

status light will stop blinking.

Starting the Datalogger in Repeat Mode

In Repeat Mode the meter simply begins datalogging again after readings are downloaded to a

PC. This allows the user to maintain the same programming selections time after time.

Datalogging is indicated by the flashing REC light as described in the other Start Modes above.

To stop recording, press and hold the START-STOP button for at least 2 seconds. The REC

status light will stop blinking.

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