RT-VLOG – VW Datalogger

Category: Geotechnical & Civil Engineering Instrumentats

HIGHLY ACCURATE

4 OR 8 CHANNEL VERSIONS

OPTIONAL 900 MHz RADIO

The RT-VLOG is a robust, cost effective, compact and user-friendly datalogger designed to monitor all pluck-type vibrating wire sensors on the market.

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Description

The new RT-VLOG is a highly accurate, robust, compact and cost-effective Vibrating Wire (VW) datalogger designed to monitor multilevel piezometers, load cells and multipoint extensometers. Available in 4 or 8 channel configurations, the RT-VLOG is ideal for use in small and medium size projects.

Its non-volatile memory can store over 63,500 records. Each record includes the VW reading and temperature reading with time and date. When the memory is full, recording either stops or overwrites the oldest record. The data stored in the memory can easily be retrieved in Hz and Engineering Units on your laptop via a USB cable. The logger manager software saves all the reading in a text file (CSV), easily imported into your spreadsheet software.

The RTV-LOG is easy to set-up and requires no programming. An optional RS-232 serial connection is available for IP modems, WIFI serial servers, etc. An internal 900MHz Hermes Radio is also available as an option on both the 4 and 8 channel versions to transmit its data wirelessly.

The Datalogger is housed in a water-tight IP 68 enclosure fitted with cable glands for signal cable routing. Plugs are provided for unused cable glands.

One lithium D-Cell battery provides power for 9 years for the 4 Channel Datalogger and over 6 years for the 8 channel RT-VLOG in a moderate temperature, assuming readings taken every hour. The extra capacity battery option (for 3 additional lithium batteries) will extend the battery life in extreme cold weather.

Specifications

Memory	63,500 records in non volatile memory, including VW reading, temperature reading with time and date
Data retrieval	USB cable
Logger Settings	Date, time, communication and memory mode (Stop or continuous by overwriting the earliest writing)
Logger Schedule	Logger start time for synchronization, reading interval (max: 1 year, min. 4 ch: 20 sec./8 ch: 30 sec.)
Sensor Setting	Sensor ID, serial number, calibration factor and sweep range for each sensor Choice of thermistor or RTD for temperature sensors
Status Indicator	3 LED to inform user of current state
Resolution	0.001% for vibrating wire sensors 0.1°C for temperature sensors
Accuracy	± 0.002% (reading + 0.04 Hz) for vibrating wire sensors ± 0.5°C for temperature sensors
VW Measurement Range	450 to 6000 Hz
Temperature Measurement Range	-20 to 120°C (Thermistor or RTD)
Temperature Operating Range	-40 to 85°C
Battery	Lithium D-Cell (Default one (1) battery, Extra Capacity Option for 3 additional batteries) Recommended: Xeno Energy # XL-205F or Tadiran # TL-5930 (TL-5930/S)
Battery Life (typical)	9 years for the 4 channel logger in moderate temperature, assuming readings at every hour 6 years for the 8 channel logger in moderate temperature, assuming readings at every hour
Optional Radio	900MHz Hermes Radio (902-928 MHz) mounted onto the circuit board
Optional Serial Connection	RS-232 serial connection available for IP modems, WIFI serial servers, etc.
Weatherproofing	IP 68 enclosure & cable glands for signal cable. Plug are provided for unused cable glands
Dimensions	22.8 x 19.8 x 9.7 cm (9.0 x 7.8 x 3.83 in.)
Weight	4 ch: 0.92 Kg, 8 ch: 1.24Kg

Note: Lithium D-Cell Batteries will only be shipped by ground transportation. Xeno Energy or Tadiran lithium D-Cell batteries can easily be sourced locally for international customers. Lithium batteries are now considered as hazardous goods for air shipment.

Ordering Info

RT-VLOG 4 4 Channel datalogger
RT-VLOG 8 8 Channel datalogger
RT-VLOG 4 HR900 4 Ch + Hermes Radio (902-928 MHz)
RT-VLOG 8 HR900 8 Ch + Hermes Radio (902-928 MHz)
RT-VLOG 4 RS232 4 Ch with serial connection
RT-VLOG 8 RS232 8 Ch with serial connection
RT-VLOG 4 RS232-S 4 Ch Sensemetrics ready
RT-VLOG 8 RS232-S 8 Ch Sensemetrics ready

Optional Accessories:

Lithium D-Cell battery1
4 Channel extra capacity battery options
8 Channel extra capacity battery options
RS-232 serial connection
Pipe mount kit 1″
Pipe mount kit 1.25″
Pipe mount kit 1.5″
Pole mount kit 6-12″
Wall mount kit

1 Lithium D-Cell Batteries will only be shipped by ground transportation. Xeno Energy or Tadiran lithium D-Cell batteries can easily be sourced locally for international customers. Lithium batteries are now considered as hazardous goods for air shipment.

Tested2 Antenna – 900 MHz Radio

Type	Gain (dBi)	Manufacturer	Mfg. Part Number	Description
Monopole	3.3	Linx Tech.	ANT-916-CW-RCS	916MHz Whip, Right Angle RF Antenna 840MHz ~ 990MHz 3.3dBi Connector, RP-SMA Male Connector Mount
Monopole	2.2	Linx Tech.	ANT-916-CW-RAH	916 Mhz Right Angle 1/4 Wave RF/RFID Whip Antenna w/ (RP-) RP-SMA Male Connector Mount
Dipole	2	Nearson Inc.	S1551AH-915S	915MHz ISM Whip, Straight RF Antenna 902MHz ~ 928MHz 2dBi Connector, RP-SMA Male Connector Mount
Dipole	2.5	Nearson Inc.	S161AH-915	915MHz ISM Whip, Straight RF Antenna 902MHz ~ 928MHz 2.5dBi Connector, RP-SMA Male Connector Mount
Dipole	2.5	Nearson Inc.	S161AH-915R	915MHz ISM Whip, Right angle RF Antenna 902MHz ~ 928MHz 2.5dBi Connector, RP-SMA Male Connector Mount
Dome	2.5	Taoglas Limited	RG.02.01.3000W	892MHz, 1.85GHz GSM Dome RF Antenna 824MHz ~ 960MHz, 1.71GHz ~ 1.99GHz 2.5dBi Connector, SMB Male
Collinear Dipole	5.15	Laird	FG9023	915MHz Whip, Straight RF Antenna 902MHz ~ 928MHz 5dBi Connector, N Female Bracket Mount