Redpost RPU-353 and Pressure Fitting
Redpost RPU-353
  • Two temperature channels
  • Pressure recording channel
  • Storage for multiple recording runs
  • 4 hour run time
  • Real-time clock
  • On-screen PU results
See also: RPU-120+ RPU-352


The RPU-353 is a special purpose electronic temperature recorder designed to monitor the tunnel pasteurisation process. It has inputs for two temperature probes for monitoring spray water and product temperature together with package internal pressure. The RPU-353 offers ultimate flexibility in use.

The instrument passes through the pasteuriser with the product and after the run the PU value achieved, together with several other important results, is calculated automatically. Standard results calculated are: total PUs achieved, time accumulating PUs, time in holding zone, maximum values of all channels etc. All sensor readings are shown continuously allowing the unit to be used as a thermometer or pressure meter.

Redpost's latest series of monitors prevents product spoilage by calculating the temperature of the product when it leaves the pasteuriser, this exit temperature is shown with the other results.

Results are displayed on the instrument allowing immediate confirmation of correct pasteurisation, the display can show graphs and lists of recorded data, data can be displayed in a choice of units. The conditions during several runs can be recorded and examined before the data is printed or transferred, this allows end-to-end working without returning to the laboratory.
Pressure is shown on all graphs and lists allowing identification of spikes in pressure that may cause package damage and therefore product wastage.

The RPU-353 is compatible with Redpost's popular RPC-80 and RPC-50 printer/chargers. With these, reports can be printed or the data can be transferred to a computer for storage and further analysis.

The controls are simple and the display shows operating prompts and results in a choice of languages and engineering units. Many functions of the equipment can be configured to suit particular requirements. All settings are protected to prevent operators making accidental changes to the configured settings.

A service reminder gives the operator a notification when a service should be considered. Calibration details can be held in the instrument to aid record keeping for ISO 9000.

Redpost PU recorders are offered with a range of temperature probes for both bottles and cans, spray water temperature probes, mounting frames, and test plugs for on-site checking of calibration. Instruments and probes are calibrated at time of manufacture against standards traceable to U.K National Standards.

Temperature Channels 1 2 2
Pressure Channel     X 
Real-time clock   X  X 
Non-volatile Storage   X  X 
Temperature Units °C °C or °F °C or °F
Recording Interval (s) 10 2-60 2-60
Service Reminder X  X  X 
Max. Time (h) 4 9 9
Max. Run Time (h) 4 42 42
Max. Files 1 43 43
Standby Mode   X  X 
Min. Temp. -5°C -5°C -5°C
Max. Temp. 105°C 105°C 105°C
Min. Operating Temp. 0°C 0°C 0°C
Max. Operating Temp. 85°C 85°C 85°C
Accuracy 0.25°C1 0.25°C1 0.25°C1
Resolution 0.01°C 0.01°C 0.01°C
English X  X  X 
French X  X  X 
German X  X  X 
Spanish X  X  X 
Russian X  X  X 
Compatible with RPC-40 X     
Compatible with RPC-42 X     
Compatible with RPC-44 X     
Compatible with RPC-50 X  X  X 
Compatible with RPC-80 X  X  X 
Pressure Units     bar (g), psi, kg/cm²
Min. Pressure.     0 bar(g)
Max. Pressure.     10 bar (g)

1 Worst case for bottle/can probe including errors over temperature, long term drift and initial errors
2 Can be special ordered with 1-9 hours run time
3 Can be special ordered with 1-6 maximum files