Wireless Water System Monitoring Recording Telemetry Unit, Customizable and Rugged

Collecting, analyzing and understanding data from networks of recording sites is a challenging task. The Telog’s RS-33u recording system offers you a versatile, economical and comprehensive solution to keep up with the data acquisition demands of today.

The Telog RS-33u provides real-time monitoring and alarming of instruments and sensors in a system package so flexible it can be customized for each application to provide you with the information you need in a concise, presentable format.

Communication Options
The power of every 33 series recorder from  Trimble Telog is wireless data transfer capability. Using cellular technology enables unmanned monitoring of remote sites as well as instant updates and alarm notifications. The Telog RS-33 systems employ a Telog proprietary, low power m2m cellular modem certified for operation on theVerizon Wireless and Sprint cellular networks in addition to an Ethernet option.

Collecting Data
The RS-33u supports multiple sensor interface options including RS-232, RS-485, one analog and one digital input. For example, when connected to an open-channel flowmeter via RS-232, the RTU can interrogate the meter for it’s most recent level, flow velocity and battery voltage measurements. PLCs, flowmeters, Sondes, etc. are also supported using a generic MODBUS client. The new MODBUS interface can be configured easily within Telog’s Enterprise software.

Telog also provides optional sensors that may be directly attached to the RS-33u including ultrasonic and pressure level, water quality Sondes, pH and conductivity, temperature, level switches and a rain gauge.

The cellular modem (if used), antenna, data recorder and battery are integrated into an environmentally rugged NEMA 4x enclosure measuring 13”L x 11”W x 6”H [330mm x 279mm x 152mm].

Power Options
The Telog RS-33u system has low power requirements allowing for a variety of power options. These are utility power with or without battery backup UPS function, solar, external DC or primary battery.

Software Support
Trimble Telog wireless recorders are compatible with all Telog software applications, including Telog Online (cloud), Telog Enterprise and Telogers for Windows application software. This ensures that utilities have a complete solution addressing all their remote monitoring requirements delivered in a manner that suits each individual utility’s operations and IT needs.

telog rs-33u system

telog rs-33u system

Directly monitor:

  • Popular open-channel wastewater flow meters
  • Pressure level sensors
  • Ultrasonic level sensors
  • Water quality sensors and Sondes
  • MODBUS supported instruments, e.g. PLCs, RTUs, etc.

Get the Telog RS-33u

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Meters, Sensors, Options

Telog-supplied Meters & Sensors

  • Pressure Level Sensor

  • Ultrasonic Level Sensor

  • Float Switch

Telog-supported Flowmeters

Flowmeters via RS-232 or RS-485 interface to meter serial interface port:

  • Hach Sigma series

  • ISCO 2150 Laser & Signature Logger

  • Marsh McBirney Flo-Dar & Flo Tote3

  • Teledyne MGD ADFM & accQmin

  • ADS Flowshark & Triton

  • FloWav area velocity sensor

Water Quality

  • Hach Hydrolab multiparameter Sondes

  • DataSonde 4a, MiniSonde 4a


  • Hach WDM Pipe Sonde



NEMA 4x Enclosure and IP67 Rated

All connectors and fittings are watertight and the product is environmentally rated IP67 to 3 meters of depth

Battery Operated

AC power is not needed, significantly reducing installation and maintenance costs


Provided with the Telog WM2/L1 cellular modem LTE Category 1 certified Verizon Wireless and upgradeable to future communications technologies

Data Backup

Data loss is not a concern because the recorder stores over 67,000 interval statistics before overwriting the oldest data with new.



Computing Flow through Wastewater Lift Stations


Recorder Model: Telog RS-33u
Type: Multi-channel RTU (recording telemetry unit)


Sample Rate: Programmable from 1/sec up to 8 hours; each channel
Data Interval: Programmable from 1/sec up to 8 hours; each channel


Size: 270 Kbytes
Storage Method: Wrap around (first-in; first-out)
Data Capacity: Dynamically allocated to active channels, any combination of:
- Analog Input: 150,000 values
- Pulse Input: 110,000 values
- Event Input: 37,000 values
- ComSensor Input: 55,000 values


- 5 pin circular connector rated IP-67
- Auto-selected baud rate to 19.2 Kbaud

Cellular: Internal Telog LTE Category 1 certified
- Certified on Sprint & Verizon in USA
- WM/H HSPA modem certified on Bell in Canada
- Dual band internal antenna


Limited to one ComSensor + one analog + one digital
ComSensor/Meter: Selectable RS-232 or RS-485 to 19.2 Kbaud. Protocol determined by meter or sensor.

- Selectable Ranges: 0-1 VDC, 0-5 VDC, 4-20 ma
- Excitation: Pulsed +5 or +12 VDC, (selectable duration)
- Resolution: 0.025%; 12 bits
- Accuracy: ±0.1% of full range at 70ºF ±50 ppm

Digital (one channel)
- Type: Selectable pulse counter or event recorder
- Input: Contact closure or logic driven input
- Excitation: 5 VDC at 20 µAmps (max)
- Pulse Width: 10 mS minimum


Size: 13”L x 11”W x 6”H [330mm x 279mm x 152mm]
Rating: NEMA 4x


Temperature: 32 to 160ºF [0º to 71ºC] -22 to 160ºF [-30 to 71ºC] powered externally
Rating: NEMA 4x

supported sensors

Pressure Level Sensor - Submersible pressure sensor
- Model: Telog PT-3Vu
- Ranges: 0-5 PSI thru 0-300 PSI
- Accuracy: ±0.25% of full scale
- Construction: 316 stainless steel
- Vent: In-line dry box with user replaceable desiccant

Ultrasonic Level Sensor - Ultrasonic transmitter (ComSensor)
- Model: UT-33u/95
- Frequency: 95 KHz
- Range: One foot to 13 feet [304mm to 3962mm]
- Beam Angle: 8° conical
- Accuracy: ±0.25% over any range segment exceeding 12” [305mm] (homogeneous environment)

Float Switch

Support Software

Telog Online (Data Hosted Solution)
Telog Enterprise
Telogers for Windows
Trimble Unity

Get the Telog RS-33u

Request a Quote