Dwyer GDL User Manual download pdf (Page 20)

DwyerLog User’s Guide Versin 1.2x 20/25

Replacing the MTL-20 Battery

The battery level of the MTL-20 can be checked using the DwyerLog software, by opening the Logger Status

window. It is suggested that the battery is replaced when the battery level reaches yellow. When the battery level

reaches red, it is imperative that the battery is replaced as soon as possible. When the battery level is too low, the

logger will stop logging automatically, resulting in data not being recorded. The DwyerLog software will give you a

warning if you try to start a logging session while the battery is low.

To replace the battery follow these steps:

1. Disconnect the logger from the USB cable. Do not replace the battery while the USB cable is connected!

2. Using a screwdriver, remove the screw in the back of the logger.

3. Remove the logger from the case.

4. Using a pen or a pencil, push the battery out of the casing, then use your fingers to slide the battery out

Avoid using pliers as they will short the battery.

5. Press and hold the logger button for about 2 seconds. This step removes any extraneous charge from the

logger system. This step is very important. The logger may not operate correctly if this step is not

performed.

6. Slide the new CR2032 battery into the battery case. Make sure that the + indicator on the battery matches

the + indicator on the battery case.

7. When the battery is replaced correctly, the LED will flash a single green flash for about 1 second.

8. Place the logger back in the case and replace the screw.

General guidelines as to how long a battery will last is shown in the table below. It is assumed that the logger uses a

fresh CR2032 battery, and is setup for continuous logging with rollover enabled.

Logging Interval Battery Life

1 Second 4 Months

5 Seconds 17 Months

10 Seconds 2.5 Years

30 Seconds 4.5 Years

1 Minute 6 Years

2 Minutes 7 Years

MTL-20 Logger Status LED

Pressing the Start/Check button makes the LED flash a series of flashes to indicate the logger status. The table

below shows the different logger states that the status light can show.

Status Light Logger State

Flashed Green one time

Logging is not in progress. Data in memory did not exceed the

alarm thresholds.

Flashed Red one time

Logging is not in progress. Data in memory exceeded one of the

alarm thresholds.

Flashed Green four times

Logging is in progress. Data in memory did not exceed the

alarm thresholds

Flashed Red four times

Logging is in progress. Data in memory exceeded one of the

alarm thresholds

Flashed Green-Red three times

Delayed logging. Logging will start at the user specified time.

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Dwyer GDL User Manual Page 20

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