RT-VLOG – VW Datalogger
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.
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 |
2 Depending on the site and the type of antenna, the radio will deliver up to a 500 KBs data rate for distances up to several kilometers/miles.
