Wireless Water System Monitoring Recording Telemetry Unit, Customizable and Rugged

Collecting, analyzing and understanding data from networks of recording sites is a challenging task. Telog’s recording system, the Telog RS-33u, 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. 

The Telog RS-33u has low power requirements and automatically monitors level, flow, pressure and water quality sensors. Data is forwarded wirelessly to a host computer operating Telog host application software, Telogers for Windows or Telog Enterprise. Data communication may be scheduled frequently (e.g. daily, hourly, every five minutes, etc.) and/or immediately in response to site alarm conditions. 

The Telog RS-33u supports multiple sensor interface options including RS-232, RS-485, analog and digital inputs. For example, when connected to an open-channel flow meter via RS-232, the RTU can interrogate the meter for it’s most recent level, flow velocity and battery voltage measurements. PLCs, flow meters, 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 Telog RS-33u including ultrasonic and pressure level, water quality Sondes, pH and conductivity, temperature, level switches and a rain gauge. 

Wireless communication is supported via the Telog WM2/L1 cellular modem LTE Category 1 certified Verizon Wireless and upgradeable to future communications technologies.

The RTU is powered from a single, 6-volt lantern battery providing an operating life of six months to two years depending on sensor interface and call schedule. 

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.

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Meters, Sensors, Options

Telog-supplied Meters & Sensors

  • Utrasonic sensor
  • Pressure sensor
  • Temperature sensor
  • pH sensor
  • Rain Gauge

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

-- Standard: Local RS-232; 4 pin circular connector rated IP-67; Auto-selected baud rate to 19.2K
-- Cellular: Internal Telog WM2/L1 cellular modem LTE Category 1 certified Verizon Wireless
-- Modem upgradable to future communications technologies

-- ComSensor/meter: Selectable RS-232 or RS-485 to 19.2 Kbaud. Protocol determined by meter or sensor.
-- Analog
     --- Selectable ranges: 0-1 VDC, 0-5 VDC, 4-20ma
     --- Excitation: Pulsed +5 or +12 VDC, (selectable duration)
     --- Resolution: 0.025%; 12 bits
     --- Accuracy ±0.1% of full range at 25% C ±50 ppm
-- Digital (one channel)
     --- Type: Selectable pulse counter or event recorder
     --- Input: Contact closure or logic driven input
     --- Excitation 5 VDC at 90 µAmps (max)
     --- Pulse width: 10 mS minimum

-- Size: 13"x11"x6" (LxWxH)
-- Rating: NEMA 4x

-- Temperature: 0 to 70º C; -30 to 70º C powered externally
-- Rating: NEMA 4x (IP66) 

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: 315 stainless steel
-- Vent: In-line dry box with user replaceable desiccant

Ultrasonic Level Sensor: Ultrasonic transmitter (ComSensor)
-- Model: Massa M300/95
-- Frequency: 95 KHz
-- Range: One foot to 13 feet
-- Beam angle: 8º conical
-- Accuracy: ±0.25% over any range segment exceeding 12 inches (homogeneous environment)

Temperature Sensor: Model: AT-3u ambient temperature sensor
-- Range: -20 to +70º C
-- Accuracy: ±0.2º C
-- Size: Stainless steel probe (4"x1/4") with 10 feet of cable

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

Get the Telog RS-33u

Request a Quote