Battery-powered 4G logger
Hawk
A 4G logger that lives inside the manhole, with no cabinet to build and no power to bring to site.
The Hawk goes inside the manhole. It powers and reads your flow, level and quality sensors over RS485, and logs as often as every second. It stores every reading on board and reports over 4G LTE to FlowSense and your own systems.
There’s no cabinet to build, no power to bring to site, and no need to enter the chamber to set it up. Nothing sits at the surface, so there’s nothing to damage, vandalise or maintain in the road reserve.
Hawk connects directly to E-Flow 3 and any other Modbus RTU sensor. One team looks after the sensor, logger, telemetry and data.
Specifications
Hawk in detail.
Telemetry
| Mobile network | 4G LTE |
|---|---|
| Logging interval | 1 second to 24 hours |
| Reporting interval | 1 minute to 24 hours |
| Data centres | Up to 4, each with primary and standby addressing |
| Configuration | EMS-Flow: Bluetooth on site, remote over 4G |
| Firmware | Remote update over 4G |
| Operating modes | Low power and debug, switchable |
Sensor interface
| Ports | 3 × RS485, independent channels |
|---|---|
| Sensors | Modbus RTU sensors, including E-Flow 3 |
| Serial settings | Baud rate, parity and stop bits set per channel |
| Protection | 15 kV ESD on every RS485 port |
| Sensor power | 2 × switched 12 V outputs, 500 mA (6 W) each |
| Warm up | Power on delay up to 255 s before each reading |
| Scheduling | Logging interval, warm up and retries set per channel |
Data and power
| On-board memory | 32 MB, 10 years of data retention |
|---|---|
| Battery | Internal: 72, 80 or 100 Ah rechargeable, or 152 Ah primary |
| Operating current | Under 65 mA average at 7.2 VDC |
| Sleep current | 40 µA or less at 7.2 VDC |
| External supply | None required |
Enclosure and environment
| Protection | IP68, submersible |
|---|---|
| Material | V0 flame-retardant, corrosion-resistant ABS |
| Lid | Bolted, O ring sealed; SIM and battery inside |
| Controls | Magnetic wake point and status indicators; no switches |
| Dimensions | Ø165 × 243 mm, excluding handle and antenna |
| Mounting | Stainless wall bracket, expansion bolts |
| Operating temperature | −40 to 60 °C, 95 % humidity non-condensing |
| Storage temperature | −40 to 85 °C |
Sensor connector wiring
| Red | 12 V switched sensor supply |
|---|---|
| Black | 0 V power ground |
| Green or blue | RS485 A |
| Yellow | RS485 B |
Ordering
| Hawk 72 | 72 Ah rechargeable. Short surveys and sites visited regularly. |
|---|---|
| Hawk 80 | 80 Ah rechargeable. General network monitoring with scheduled visits. |
| Hawk 100 | 100 Ah rechargeable. Long intervals and several sensors on one logger. |
| Hawk 152 | 152 Ah primary. The longest unattended service, for permanent and remote sites. |
| Chamber sensing | Option for any model: methane, temperature and humidity, and tilt to flag a disturbed unit. |
Typical values. Battery life depends on logging and reporting intervals, sensors and temperature, so we size the battery for each site. Full details are in the Hawk datasheet.
Put a Hawk in the manhole.
Tell us the sites and the data you need. We’ll size the battery, install and commission from the surface, and deliver the data through FlowSense. Hawk is in our rental fleet for temporary surveys too.