MSM-P400-420
Industrial pressure transmitter with 4-20mA output, 0-400kPa range, IP67 enclosure, and G1/4 process connection for i...
Product Overview
Description
The MSM-P400-420 is a complete industrial pressure measurement solution featuring integrated MEMS sensor, signal conditioning, and 4-20mA output. The 0-400kPa range covers common industrial pressure applications.
With ±0.5% accuracy and IP67 enclosure rating, this transmitter provides reliable measurement in harsh industrial environments. The 4-20mA output ensures noise-immune signal transmission over long cable runs.
The stainless steel construction and G1/4 process connection provide broad media compatibility and easy installation. Factory calibration and temperature compensation ensure accurate measurement out of the box.
Product Series
MSM
Primary Application
Hydraulic system pressure monitoring
Key Features
- Complete transmitter with 4-20mA output
- ±0.5% accuracy for precise measurement
- IP67 enclosure for harsh environments
- Stainless steel construction for media compatibility
- Two-wire connection for simple installation
- Factory calibrated and temperature compensated
Specifications
| Pressure Range | 0-400kPa (Gauge) |
|---|---|
| Output Signal | 4-20mA (2-wire) |
| Accuracy | ±0.5% FS |
| Supply Voltage | 12-30VDC |
| Enclosure Rating | IP67 |
| Process Connection | G1/4 Male |
| Wetted Materials | 316L Stainless Steel |
| Operating Temperature | -20°C to +80°C |
Applications
Hydraulic system pressure monitoring
Electronic system design
Pneumatic system control
Industrial automation and control
Water and wastewater treatment
Electronic system design
HVAC pressure measurement
Data acquisition and conversion
Pump and compressor control
Industrial automation and control
Industrial process control
Industrial automation and control
FAE Expert Insights
"The MSM-P400-420 is an excellent solution for industrial pressure measurement applications. The integrated design eliminates the need for external signal conditioning, simplifying installation and reducing system cost. I've deployed these transmitters in numerous hydraulic and pneumatic systems with excellent reliability. The 4-20mA output is compatible with virtually all industrial PLCs and controllers. The IP67 rating handles washdown environments common in food processing and industrial applications. The ±0.5% accuracy is suitable for most process control applications. I particularly appreciate the stainless steel construction which handles a wide range of media without compatibility concerns. The G1/4 connection is standard in most industrial equipment, making retrofit straightforward. For installation, ensure proper thread sealant and torque (25-30 Nm). Overall, this transmitter offers industrial-grade performance at a very competitive price point."
Reliable industrial pressure transmitter with easy 4-20mA integration
— Thomas Li, BeiLuo
Frequently Asked Questions
What is the maximum cable length for 4-20mA output?
The maximum cable length for 4-20mA transmitters depends on supply voltage and loop resistance: 1) At 24V supply with 500 ohm load resistor, maximum loop resistance is approximately 600 ohms; 2) Typical 18 AWG cable has 6.5 ohms/1000ft resistance; 3) This allows cable runs up to 3000+ feet in theory; 4) Practical limit is typically 1000-2000 feet due to noise and capacitance; 5) Use shielded twisted pair cable for noise immunity. The MSM-P400-420 can drive up to 500 ohm load at 24V supply. Calculate total loop resistance including cable, load resistor, and any additional devices.
For long cable runs, verify total loop resistance is within transmitter drive capability. Use shielded cable for noise immunity.
How do I calibrate the transmitter for my application?
The MSM-P400-420 is factory-calibrated and typically requires no field calibration. For applications requiring traceability or verification: 1) Zero calibration - vent transmitter to atmosphere and verify 4mA output; 2) Span calibration - apply known pressure (e.g., using deadweight tester) and verify 20mA at full scale; 3) Document calibration data for quality records; 4) Some models offer trim potentiometers for fine adjustment. The transmitter's excellent stability (±0.2% FS/year) minimizes drift. For critical applications, annual verification may be performed without adjustment if within tolerance.
Factory calibration is sufficient for most applications. Perform verification only if required by your quality system.
Can the transmitter handle pressure spikes?
The MSM-P400-420 has built-in overpressure protection: 1) Safe overpressure: 1.5x full scale (600kPa) without damage; 2) Burst pressure: 3x full scale (1200kPa) without rupture; 3) For frequent pressure pulsations, consider adding a snubber or damper; 4) The MEMS element is inherently robust against pressure spikes. For hydraulic applications with rapid valve operation, a pressure snubber (dampener) in the pressure line is recommended to protect the transmitter and improve reading stability. The transmitter will indicate over-range conditions by outputting slightly above 20mA (typically 20.5-21mA).
The transmitter handles normal pressure transients. Add snubbers for severe pulsating applications.
What maintenance is required for the transmitter?
The MSM-P400-420 requires minimal maintenance: 1) Periodic visual inspection of enclosure and cable connections; 2) Check for process connection leaks; 3) Verify output signal at known pressure points annually (optional); 4) Clean external surfaces as needed; 5) No internal maintenance required. The solid-state MEMS sensor has no moving parts and excellent long-term stability. For harsh environments, inspect more frequently for corrosion or damage. The IP67 enclosure protects internal electronics, but external damage should be addressed promptly. Expected service life is 10+ years in normal industrial environments.
Minimal maintenance required. Perform visual inspections per your facility maintenance schedule.
How do I troubleshoot a 4-20mA transmitter?
Troubleshooting 4-20mA transmitters: 1) Verify power supply voltage at transmitter (12-30VDC); 2) Check loop continuity with multimeter; 3) Verify load resistance is within transmitter capability; 4) Check for reversed polarity; 5) Verify process pressure is within range; 6) Test transmitter by venting to atmosphere (should read 4mA); 7) If output is fixed at 3.6mA or 21mA, indicates fault condition; 8) Check for ground loops or noise interference. Use a loop calibrator to inject known currents and verify system operation. If transmitter is suspected faulty, replace with known-good unit for comparison.
Follow systematic troubleshooting steps. Contact our technical support if problems persist after basic checks.