Product Overview
The Telog Ru-35 is Badger Meter’s IP68 submersible telemetry RTU — a battery-powered multi-channel recorder built to sit in a flooded manhole or vault and keep monitoring sewer and underground-water-vault instruments in real time. Its 4G LTE / Category 1 cellular modem calls the Telog RM cloud on a schedule or in response to a high-level alarm, but it writes to onboard memory first — 1 MB of wrap-around storage holds up to 670,000 readings — so a coverage gap costs nothing. Eight channels take pressure, flow, level and water-quality sensors through RS-232/RS-485, Modbus, SDI-12, I2C and analog inputs, and the unit interrogates an open-channel meter directly over RS-232 for its level and flow-velocity readings. Dual user-replaceable 6V alkaline lantern batteries keep a below-grade site running unattended for six months to two years — up to roughly four years on a daily call schedule — with an external 9–15V DC feed available for longer-duty sites. Paired with a Beluga or Raven-Eye 2 area/velocity sensor it is the wet-site workhorse for CSO/SSO overflow capture, inflow-and-infiltration studies and collection-network model calibration, with the Telog RM Historian and its ArcGIS connector carrying the data through to your GIS and SCADA.
Key Features & Benefits
- Submersible IP68 / NEMA 6P build — a sealed polycarbonate housing with separate battery and electronics chambers rides out submergence in a flooded manhole or vault, so the logger keeps running through a surcharge event
- Logs first, transmits second — 1 MB of wrap-around memory holds 150,000 to 670,000 readings on board before they are sent, and data is buffered when cellular coverage drops — no gaps in the record
- Eight channels in one unit — reads flow, pressure and water-quality sensors together — analog, digital pulse/event, and absolute-encoder meter registers — at a single site
- Open sensor interfaces — RS-232/RS-485 (to 115 kbps), Modbus, SDI-12, I2C and 4–20 mA accept most field sensors and open-channel meters without an adapter box
- Long battery life — dual user-replaceable 6V alkaline lantern batteries run a wet, below-grade site between visits — six months to ~4 years depending on call schedule
- 4G LTE cellular to the cloud — an internal Category 1 LTE modem calls the Telog RM cloud on a schedule or on alarm, for unmanned monitoring of remote sites
- Pairs for area/velocity — add a Beluga or Raven-Eye 2 sensor to capture overflow events and I&I in partially-full pipe
Specifications
- Function
- IP68 submersible, battery-powered multi-channel recording telemetry unit (RTU) for real-time monitoring of flow, pressure and water-quality sensors in sewers and underground vaults
- Inputs / channels
- Eight channels — I2C pressure (1–2), 4–20 mA current loop (3), 0–5V analog (4), digital pulse/event (5–6) and absolute-encoder meter register inputs (7–8); 1 MB wrap-around memory holding 150,000–670,000 values by input type
- Sensor interfaces
- RS-232 / RS-485 to 115 kbps, Modbus, SDI-12, I2C, 4–20 mA and 0–5V analog; Bluetooth Low Energy for local connection
- Telemetry
- Internal 4G LTE / Category 1 cellular modem to the Telog RM cloud; logs to local memory first and calls on a schedule or on alarm, so a coverage gap loses nothing
- Power
- Factory-installed dual user-replaceable 6V alkaline lantern batteries — six months to two years of operation depending on sensor interface and call schedule (up to ~4 years at a 24-hour call schedule); 9–15V DC external-power input
- Enclosure / protection
- IP68 / NEMA 6P submersible housing, injection-molded polycarbonate, two sealed chambers (battery and electronics), 9 lb (4 kg), for in-manhole and below-grade siting
- Application focus
- CSO/SSO overflow-event capture and inflow-and-infiltration (I&I) monitoring; pairs with a Beluga or Raven-Eye 2 area/velocity sensor
- Platform & integration
- Streams to the Telog RM cloud over its cellular link, with the Telog Historian archive and an ArcGIS / API connector for SCADA and GIS integration
Common Applications
- Submerged sewer and manhole monitoring in wet, below-grade sites
- CSO/SSO overflow-event capture for regulatory compliance
- Inflow-and-infiltration (I&I) studies and collection-network model calibration
- Portable flow studies where a logger may be submerged
Design & Selection Considerations
- Log locally first — no power or signal required — every Telog device records to local memory and runs standalone indefinitely, so a site keeps recording even with no power and no network. Connectivity is optional at the start — a standalone logger can be promoted to live telemetry later without re-engineering.
- Recorder or cellular RTU? — battery recorders (HPR-32A, PR-32A, RG-32A) suit surveys and temporary studies you collect on a schedule; cellular RTUs (Ru-32, Ru-35, RS-45) transmit to the Telog RM cloud for permanent, real-time monitoring and alarming. Recorder for portable or temporary work; RTU for fixed sites you watch continuously.
- Match power and housing to the site — choose a multi-year lithium battery, solar, or AC power, and an IP68 submersible housing for vaults and sewers. The RS-45 runs continuous AC/solar duty; the Ru-35 is the submersible choice. Power and ingress rating decide where a site can go — spec them with the measurement.
- Open-channel: radar or submerged ultrasonic? — for sewers and partially-full pipes Telog uses the area-velocity method. The Raven-Eye 2 is non-contact radar (±0.5% velocity) — nothing touches the stream, so no fouling and no confined-space entry; the Beluga is submerged ultrasonic (±1%) that works even when the pipe surcharges, with integrated level and shallow-flow capability. Radar when you can see the surface and want the highest velocity accuracy; ultrasonic when it surcharges or radar can’t see in.
- Capture transients when they matter — for surge and water-hammer analysis specify the high-speed impulse variants — HPR-32iA, PR-32iA and the Ru-32iMA — which capture fast pressure transients a standard recorder would miss. Routine pressure logging and transient capture are different jobs — pick the impulse build when surge is the question.
- Plan the data path — cloud, SCADA, or both — Telog devices report to the Telog RM cloud (built on Esri ArcGIS) over their cellular link; the line-powered RTUs and gateways can also export to your SCADA over Modbus RTU, 4–20 mA or SDI-12, while the battery cellular recorders deliver through the cloud. Decide the destination — and confirm the outputs your specific device carries — up front.
To size & select the right Telog Ru-35:
Use the input form to tell us what you need to measure and where, how the site is powered (battery, solar or AC), and how you want the data (the Telog RM cloud, your SCADA, or both) — and we’ll spec the recorder, RTU, sensor and outputs for your monitoring program.
Flow Meter Application Sheet ›Talk to an engineer directly — Scott Prater, Principal · 917-580-0878 · scott@pratertechnical.com
Specifications compiled by Prater Technical Partners from Badger Meter Telog product datasheets.