RST Instruments DT2055B Instruction Manual

All efforts have been made to ensure the accuracy and
completeness of the information contained in this document. RST
Instruments Ltd reserves the right to change the information at any
time and assumes no liability for its accuracy.
Copyright © 2020. RST Instruments Ltd. All rights reserved.
Document Number: ELM0088B
Release Date: August 14, 2020
DT Series Dataloggers
Maintenance and Service
Guidelines

DT Series Datalogger
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Guidelines
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REVISION HISTORY
Rev. Revision History Date Prepared By Approved By
A Initial release 2018-Aug-07 CM JW
B Added GAA2820 and DTSAA, removed
contact information from Section 5.
2020-Aug-14 JW AB

DT Series Datalogger
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Guidelines
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TABLE OF CONTENTS
1 INTRODUCTION ............................................................................................................4
2 BATTERY ....................................................................................................................5
2.1 Battery Safety ...................................................................................................5
3 MOISTURE PREVENTION ..............................................................................................5
3.1 Desiccant Pack .................................................................................................6
4 MAINTENANCE ............................................................................................................7
5 SERVICE AND REPAIR ..................................................................................................7
LIST OF FIGURES
Figure 1-1 RST Instruments DT Series dataloggers ...................................................................4
Figure 3-1 Tighten screws in the following order ........................................................................6
LIST OF TABLES
Table 3-1 Corresponding desiccant packet per datalogger ........................................................7

DT Series Datalogger
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Guidelines
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1 INTRODUCTION
RST DT Series Dataloggers are mounted inside NEMA 4X (IP66) weather-resistant
enclosures which are dust-tight and water-resistant. The dataloggers can be
exposed to elements such as rain and splashes of water, but they are not waterproof
and are not suitable to be submerged.
RST DT Series Dataloggers are low maintenance but require some periodic
servicing. Follow the maintenance guidelines as provided in this manual to ensure
long lifespan of the dataloggers.
Note that any service or maintenance involving the exposure of the logger’s internal
components should be performed in clean and dry conditions.
CAUTION:
AVOID OPERATIONS WITH THE LOGGER COVER OFF IN RAIN OR SNOW.
DO NOT ALLOW RAIN OR SNOW TO ENTER THE ENCLOSURE.
DO NOT INSTALL IN LOCATIONS PRONE TO FLOODING.
DT LOGGERS ARE RAIN-TIGHT BUT CANNOT BE SUBMERGED.
FIGURE 1-1 RST INSTRUMENTS DT SERIES DATALOGGERS

DT Series Datalogger
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Guidelines
ELM008
8B RST Instruments Ltd. Page
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2 BATTERY
The recommended battery models for most RST DT Series Dataloggers are the
SAFT LSH14 (lithium-thionyl chloride C-Cell) or SAFT LSH20 (lithium-thionyl chloride
D-Cell). SAFT LSH20 is the recommended battery for all datalogger units with
RSTAR and DT Link wireless capability. The only exception is that the DTSAA logger
only supports SAFT LSH20 battery.
Battery lifespan is difficult to accurately predict due to the number of variables that
can affect it, including measurement interval, number of sensors being measured,
radio signal (if applicable), temperature, and humidity, among others.
Although battery voltage data is logged in all DT Series dataloggers, lithium-thionyl
chloride batteries generally stay at full voltage before suddenly dropping and
depleting. This makes it difficult to predict when lithium-thionyl batteries should be
replaced. Contact RST Instruments to determine the recommended approximate
battery replacement schedule.
It is recommended to disconnect the battery when the DT Series dataloggers are not
in use as the dataloggers will continue logging if the batteries are left installed. Store
the batteries at room temperature if possible.
2.1 BATTERY SAFETY
CAUTION:
DO NOT ATTEMPT TO RECHARGE THE BATTERY.
DO NOT REPLACE THE BATTERY WITH AN ALKALINE OR ZINC-CARBON BATTERY.
DO NOT SHIP THE DT-SERIES DATALOGGERS WITH THE BATTERY INSIDE.
Follow local laws and regulations of your region for battery disposal.
Contact RST for replacement batteries.
3 MOISTURE PREVENTION
RST DT Series Dataloggers are housed in weather resistant, NEMA 4X IP66 rated
enclosures. This prevents rain, snow, and dust from entering the enclosure but only if
the dataloggers are properly installed and sealed. RST DT Series Dataloggers are
not submersible.
Each datalogger has up to four areas of entry for moisture and humidity if not
properly sealed:

DT Series Datalogger
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Guidelines
ELM008
8B RST Instruments Ltd. Page
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•Datalogger lid: The datalogger lid will need to be removed and reinstalled from
time to time for instrument wiring and periodic maintenance. It is important to
ensure the O-ring is free of debris before reassembling the lid. Refer to Figure 3-
1 for the proper sequence to follow when tightening the screws on the datalogger
lid. Each screw will need to be loosely tightened in the sequence shown in Figure
3-1 before being tightly screwed in the same sequence.
FIGURE 3-1 TIGHTEN SCREWS IN THE FOLLOWING ORDER
•Cable glands: ensure the cables are clean prior to inserting into the logger to
prevent introducing dirt in through the gland opening. It is important to ensure all
cable glands are sealed. The cable gland plugs should remain secured on any
unused cable glands. Cable glands with sensor cables through should be
securely sealed. Refer to the “Datalogger Hardware Connections” video for
proper sealing guidelines located on the RST website at
https://www.rstinstruments.com/Geotechnical-Videos.html or via YouTube
directly at https://youtu.be/a5hHQaN1NkI
•USB connector: ensure the lid is firmly screwed in to provide a watertight seal
when the USB is not in use. The USB connector lid contains a rubber gasket to
seal the USB connector lid.
•Antenna connector (if applicable): Plug the antenna connector with the provided
rubber connector cap when the antenna is not in use. When the antenna is in
use, ensure it is screwed on hand tight and facing upwards.
Moisture intrusion is a possibility if any of these items are not properly sealed.
3.1 DESICCANT PACK
A desiccant packet is provided inside each datalogger during point of sale. These
packs should be replaced if they ever appear to be moist or if any moisture is present
inside the enclosure. It is recommended to replace the desiccant packets each time
the battery is replaced or as required if the dataloggers are installed in climates with
high humidity.
Refer to Table 3-1 for the corresponding desiccant packet per datalogger.

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TABLE 3-1 CORRESPONDING DESICCANT PACKET PER DATALOGGER
Datalogger Corresponding Desiccant Packet
DT2040, DT2055B ULINE S-3906, 10-gram desiccant pack
DT2011B, DT2306, DT2350, DT2485, DT4205,
DTL201B + DTL202B, GAA2820, DTSAA
ULINE S-3902, 1-gram desiccant pack
4 MAINTENANCE
Additional service and maintenance may be required depending on site conditions.
Inspect the dataloggers for any signs of moisture or corrosion whenever the battery
is replaced. Contact RST Instruments for troubleshooting recommendations if
moisture or corrosion is detected.
Inspect the antenna if the diagnostic data shows any issue with the radio signal.
Examine the dataloggers for loose internal and external antenna connections,
damage to the antenna, and any moisture inside the enclosure.
Any datalogger upgrades or repairs should be performed by or under specific
direction from RST Instruments Ltd.
Contact RST Instruments for any maintenance and servicing questions.
5 SERVICE AND REPAIR
The product contains no user-serviceable parts. Contact RST for product service or
repair not covered in this manual.