Rapidlogger Max - Job Monitoring Systems for Fracturing Units
The Rapidlogger NextGen Max is a frac pump monitoring and recording system for fracturing and stimulation units. One Max unit measures, displays and records the pressure, rate and volume of up to eight fracturing pumps, and several units can be daisy-chained for larger fleets. Densitometer and flowmeter inputs are available for proppant concentration and clean rate. The unit records on its own; a PC with RapidVu adds live graphs and the job report.
Who uses it
Fracturing and stimulation crews that need a treating record per pump, acid and nitrogen pumping units, pump-down crews, and data van operators who want each pump's rate and pressure delivered to the van over Ethernet or WiFi. The Max is also used as the main unit of a workover rig EDR.

What it measures
- Treating pressure from a transducer on each pump or from a single sensor on the treating iron near the wellhead
- Pump rate and total for each pump from a proximity-switch stroke counter on the plunger or drive shaft, with the pump displacement entered once per pump
- Combined slurry rate and total for all pumps on the unit
- Proppant concentration or slurry density from a non-contacting radioactive densitometer
- Clean rate from a turbine, magnetic or Coriolis flowmeter
- Hydraulic horsepower, calculated from pressure and rate (see Tech Note 55)
With 16 analog and 8 frequency inputs there is room for suction pressure, fluid temperature, tank level or engine RPM on the same unit. Each pump can be tripped when its pressure exceeds a limit set by the operator, using the solid-state relay outputs.

Software and data
The system comes with RapidVu, the PC software for monitoring, graphing and printing quick job reports. Job data is recorded on SD cards in the unit and is available in real time over Ethernet or WiFi. RapidHub joins several Rapidlogger units into one data stream for the data van, and WITS, MODBUS and ASCII outputs feed third-party treatment monitoring software. A PC is not required to run and record a job.
How it works
An equipment operator can use the system without training: power it up and it starts displaying and recording. The backlit LCD shows pressure, density, total volume, total rate and individual pump rates; further pumps are recorded and transmitted even when they are not on the screen. High-speed sampling with digital filtering removes plunger pulsation from the recorded pressure and rate. The system is expandable, and more data acquisition channels can be added as required.
Specifications
| Operating Temperature: | -40C to 70C |
| Operating Environment: | NEMA 4X |
| Pressure / Analog Inputs: | 16, 24 bit |
| Rate / Frequency Inputs: | 8 |
| Display: | LCD with backlight |
| Computer Interface: | Serial, Ethernet, WiFi |
| Power: | 12/24 VDC, 110/240 VAC |
| Job Memory: | 16 GB |
Downloads
- NextGen Max for fracturing and stimulation units datasheet (PDF)
- Rapidlogger User Manual Rev AG (PDF) or the online manual
- RapidVu software download
Related tech notes
- Tech Note 55: Setup Hydraulic Horse Power (HHP) Variable
- Tech Note 57: Wiring and Setup for Using a Rapidlogger for Over Pressure Shutdown of a Pumping Unit
- Tech Note 103: Frequency Inputs and Pump Rate Variable Mapping
- Tech Note 52: Connecting Multiple Rapidloggers using RapidHub Program
- Tech Note 22: Setting up RapidVu for Data Output to a WITS Capable System
- Tech Note 46: Using Rapidlogger with Endress-Hauser Passive Outputs
- Tech Note 62: Using Rapidlogger with Micromotion Coriolis Flow Meter
Related products
- Rapidlogger for cementing, frac and pumping units
- Rapidlogger Mini for single-pump units
- Cloud data link for remote monitoring
- Instrumentation primer: fracturing services and sensors
Ask about the Rapidlogger Max
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.

