Rapidlogger Products - Returns Flow Sensor
The Rapidlogger returns flow sensor is a self-contained system for monitoring and recording the returns flow from a well. It mounts in the return flow line (the mud flow line) and measures the flow level and rate coming back from the hole, so a loss or a gain shows up before it reaches the pits. It was designed from the ground up for continuous use in extremely hot or cold environments without failure.
Who uses it
Drilling and workover contractors who want flow-out alongside flow-in and pit volume on the rig record, well-control focused operators, and sludge and slurry pumping services that need a rugged flow and volume record. The sensor is part of the Rapidlogger EDR and drilling rig monitoring systems and can also be used with other data acquisition systems.
Applications
Drilling applications:
In the drilling application the returns flow sensor monitors the flow level in the return flow mud line. The system can monitor, display and record wellhead returns flow rate, return flow volume, temperature and H2S level. Compared with the pump rate from the stroke counters and the active pit volume, the returns flow gives the earliest indication of a kick or lost circulation.
Sludge pumping applications:
For sludge and slurry pumping the sensor and system can be supplied with pH and temperature sensors in addition to flow, and measure the flow rate and volume pumped.

How it is installed
The sensor sits in the flow line between the bell nipple and the shale shakers, where the returns run in an open channel. It is powered from the rig's 12 or 24 V DC supply or from 120 V AC and sends its readings to the Rapidlogger unit, where the flow-out is displayed, recorded and transmitted over WITS or MODBUS to the mud logging unit. The IP67 / NEMA 6 enclosure is sealed against wash-down and submersion.
Specifications
| Dimensions: | 16 x 6 x 6 inch |
| Operating Temperature: | -20C to 60C |
| Enclosure Rating: | IP67, NEMA 6 |
| Power In: | 9-36 VDC, 120 VAC |
Part Number: 00-93601


Downloads
Related tech notes
- Tech Note 48: Level Sensor Calibration For Square And Stepped Tanks For Rapidlogger Systems
- Tech Note 110: Running RapidVu in Driller Display Mode on Drilling and Workover Rigs
- Tech Note 35: Setting Up Rapidlogger With Flowmeters
- Tech Note 104: How Analog Sensor Scaling (Multiplier and Offset) Works
Related products
- EDR system for workover rigs
- Monitoring systems for drilling rigs
- Instrumentation primer: flow sensors
Ask about the returns flow sensor
For a quotation, a sensor list for your unit or help choosing a configuration, email websales@rapidlogger.com, call (713) 574-1052 or use the contact page. Rapidlogger Systems is in Stafford, Texas, and ships worldwide.

