SCAIME CPJ RAIL Weighing Transmitter

Full Product Name: CPJ RAIL DIN Rail Mount Strain Gauge Signal Conditioner / Weighing Transmitter

Brand: SCAIME (France, specialist manufacturer for weighing & force measurement), Made in France

1. Model Definition

CPJ: Product series, strain bridge signal conditioner module

RAIL: DIN rail mounting version (PCB board version & IP65 enclosure version are also available)

CPJ2S RAIL: Enhanced version with 2 relay threshold outputs for high/low limit alarm

2. Core Specifications

3. Function Description

Receives millivolt-level weak bridge signals from strain gauge weighing / force sensors, performs amplification, filtering and linearization, then converts signals into standard analog outputs (4-20mA / 0-10V) for direct acquisition by PLC.

Suitable for tank weighing, silo weighing, press force measurement, tensile testing, web tension measurement

Shunt calibration is a key advantage, easy commissioning for industrial automated weighing & force measurement systems

DIN rail installation inside control cabinet, replaces the signal transmission function of conventional weighing indicators

4. Typical Application Scenarios

Tank / silo weighing, press force monitoring, assembly force monitoring, wire rope tension measurement, material testing machines, industrial process weighing.

5. Alternative Selection Reference

Similar strain gauge transmitter modules:

HBM RM4220

Burster 9250

Mettler Toledo weighing transmitter

Domestic alternatives: Tianmu (Shanghai), Bengbu sensor DIN rail weighing transmitters

6. Common Troubleshooting
7. No output: Check 24V power supply, sensor excitation voltage and wiring priority (6-wire must connect compensation lines)
8. Zero drift: Check sensor shield grounding, reduce interference from power cables and adjust internal filter parameters
9. Incorrect calibration: Use Shunt calibration, confirm mV/V sensitivity matches sensor nameplate
10. Output saturation: Wrong range setting or sensor overload

SCAIME CPJ RAIL Application Scenarios

CPJ RAIL is a DIN rail mounted strain bridge signal conditioner. It receives weak mV/V signals from strain-based sensors (weighing, force, tension, torque) and outputs standard 4~20mA / 0~10V analog signals to PLC; CPJ2S RAIL is equipped with 2 relay threshold outputs for over-limit alarm and equipment interlock protection.

1. Batching & Tank/Silo Weighing (Chemical, Food, Pharmaceutical, Building Material, Lithium Battery)
2. Static batching for reactors, mixing tanks and hoppers: supports up to 4 pcs of 350Ω load cells in parallel, 6-wire configuration compensates temperature drift for automatic formula feeding control
3. Continuous weight monitoring for storage silos and tanks, alternative to radar level sensors, immune to dust and dielectric constant variation
4. Dosing & filling for powder, granule and liquid; valve interlock when weight reaches setpoint (CPJ2S relay output)
5. Web & Film Tension Control (Paper, Printing, Non-woven, Lithium Battery Electrode, Plastic Film)

Real-time tension measurement for unwinding & rewinding rollers paired with tension sensors. The tension signal is transmitted to PLC for closed-loop speed regulation to prevent web breakage and stretching deformation; classic SCAIME reference application.

3. Press & Assembly Force Monitoring (Automotive Components, 3C, Hydraulic Press, Press-fit Equipment)

Force monitoring for servo presses, riveting and press-fit processes, capture force curves to judge product OK/NG. Max bandwidth up to 20kHz to capture transient impact force

Material mechanical testing: tensile and compression test machines for static / quasi-static material strength testing

4. Overload Protection for Lifting Equipment (Gantry Crane, Overhead Crane, Port Crane, Wire Rope Force Measurement)

Load pins / wire rope force sensors connected to CPJ RAIL for real-time hoisting load monitoring. CPJ2S triggers relay action to cut lifting circuit for overload protection, official SCAIME crane application case.

5. Other Force & Weighing Applications
6. Belt scale, dynamic checkweigher: material weight monitoring on conveyor belts (select proper filter to suppress vibration noise)
7. Structural stress monitoring for steel structures, bridges and tooling: direct strain measurement via strain gauges
8. Torque measurement: signal transmission for strain type torque sensors on drive shafts
9. Packaging machine, bag checkweigher: static weighing on production line to reject non-conforming products

Selection Tips

Only analog signal required for PLC: CPJ RAIL

High/low limit alarm and direct relay interlock required: CPJ2S RAIL

Key Advantages: Built-in Shunt calibration, no test weights required for on-site calibration; DIN rail mounting inside cabinet, neat wiring, compatible with 4-wire / 6-wire load cells.

SCAIME CPJ RAIL (DIN Rail Version) Dimensions

DIN rail housing (CPJ RAIL / CPJ2S RAIL share identical housing dimensions)

Length × Width × Height: 120 mm × 22.5 mm × 100 mm

Width: 22.5 mm (standard DIN35 rail mount, occupies one small module slot in control cabinet)

Height: 100 mm (including top & bottom rail clips)

Depth: 120 mm (protruding into cabinet from rail surface)

Weight:

CPJ RAIL (basic version): ~135 g

CPJ2S RAIL (with 2-channel alarm relays): ~183 g

Remarks:

1. PCB bare board version and IP65 field enclosure have different dimensions; above applies only to DIN rail housing.
2. Official CAD drawings available on TraceParts for cabinet layout and 3D design.
3. CPJ and CPJ2S share same rail housing outline, only internal relay board added for CPJ2S.

SCAIME CPJ RAIL / CPJ2S RAIL Accuracy Specifications

Accuracy Class: 0.05% FS (Full Scale)

This is the transmitter intrinsic comprehensive accuracy (linearity, hysteresis, repeatability included), excludes error of load cell itself

Temperature Drift (Key Parameters)

1. Zero temperature drift: ≤ 0.035 %FS / ℃
2. Span (gain) temperature drift: ≤ 0.02 %FS / ℃

Operating Temperature Range: 0 ~ +70℃

Supplementary Notes

1. CPJ RAIL and CPJ2S RAIL have identical accuracy performance; difference is 2 relay alarm outputs on CPJ2S.
2. Input sensitivity range: 0.15 ~ 12 mV/V, compatible with most strain-based force & weighing sensors.
3. Total system error = transmitter error + sensor error + mechanical mounting error;

Example: If load cell accuracy is 0.02% FS, combined system accuracy is approx. 0.07% FS.

Selection Tips

0.05% FS is high-end industrial strain gauge transmission performance, suitable for press-fit force, precise tank batching and tension monitoring.

For trade legal metrology weighing (OIML), CPJ RAIL is merely a transmitter module, cannot be used alone as a legal weighing instrument.