AutoZero Melt Pressure Transmitters | SIL2 & Digital Calibration | MPES Series
MPES Series Precision AutoZero & SIL2 Melt Pressure Transmitter
Engineered for modern, automated plastic extrusion lines, the MPES Series delivers high-precision melt pressure measurement powered by digital compensation circuitry. Designed with an integrated remote AutoZero function—activated effortlessly via PLC or simple pin shorting—and certified for SIL2 functional safety environments, the MPES Series eliminates manual potentiometer tuning while delivering exceptional signal stability under demanding industrial conditions.
Key Highlights:
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Remote AutoZero Calibration: Zero the transmitter instantly via PLC signal or remote pin shorting, eliminating thermal drift errors before production runs.
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SIL2 Safety Compliance: Designed to satisfy international functional safety standards for overpressure protection in automated lines.
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Digital Linear Compensation: Advanced digital mode circuit design provides superior signal linearity and high-stability pressure telemetry.
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Automated System Ready: Seamlessly integrates into modern PLC architectures requiring automated diagnostics and maintenance-free zero adjustments.
Description
High-Precision Measurement for Next-Generation Extrusion
The MPES Series Precision AutoZero Melt Pressure Transmitter sets the standard for automated polymer extrusion, sheet lines, and compound compounding where precision and safety are paramount. Built around an advanced digital signal processing architecture, the MPES Series uses internal digital linear compensation to compensate for temperature fluctuations and mechanical stresses, delivering tighter control tolerances than traditional analog sensors.
Smart Calibration & SIL2 Safety Integration
Manual zero-point adjustments during hot machine startup are now a thing of the past. The MPES Series incorporates a convenient remote AutoZero feature. By briefly shorting dedicated calibration pins—either through an automated PLC digital output or a remote push button—the system instantly offsets thermal zero shifts at operational process temperatures.
Furthermore, designed in accordance with SIL2 safety standards, the MPES Series delivers the diagnostic coverage and reliability needed to safeguard high-pressure extruders against catastrophic equipment failure and overpressure events.
(Note: Looking for standard industrial replacements for legacy hardware? View our standard MP Series. For environmentally sensitive, mercury-free, or 700°C extreme thermal applications, see our MPE Series.)
Features
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Remote Pin-Shorting AutoZero: Allows fast, automated zeroing via PLC control or external contact closure without opening the electrical housing.
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SIL2 Safety Rated Compliance: Engineered to meet SIL2 functional safety requirements for automated plant safety loops.
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Digital Compensation Circuitry: Microprocessor-driven linear compensation provides exceptional measurement accuracy and minimal thermal drift.
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High Long-Term Stability: Advanced digital filtering protects against pressure spikes and signal jitter during continuous operation.
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80% Internal Shunt Calibration: Supports standard full-scale span verification alongside digital AutoZero functions.
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Multiple Amplified Signal Outputs: Options for 4-20mA 2-wire, 0-10V, or 0-5V signals for direct controller integration.
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Robust Mechanical Construction: Flexible armor and rigid stem options designed for demanding industrial melt processing up to 400°C.
Specification
| Parameter | Technical Specification |
| Circuit Architecture |
Digital Microprocessor with Linear Compensation |
| Calibration Method |
Remote AutoZero (Pin Shorting) + 80% Internal Shunt |
| Safety Certification |
SIL2 Compliant Circuit Design |
| Accuracy Class |
+/- 0.25% FS (High Precision); +/- 0.5% FS (Standard) |
| Pressure Ranges |
0-35 bar to 0-2000 bar (0-500 psi to 0-30,000 psi) |
| Output Signals |
4-20mA, 0-10V, 0-5V, 3.33 mV/V |
| Diaphragm Max Temperature |
400°C |
| Electronic Housing Temp |
-20°C to +85°C |
| Mounting Threads |
1/2-20 UNF-2A, M18x1.5 (Standard industrial threading) |
| Stem Configurations |
Rigid Stem, Flexible Armor Stem, or Dual Temp/Pressure |
FAQ
Q1: How does the remote AutoZero feature work on the MPES Series? A: The MPES Series allows you to calibrate the zero point remotely without turning manual potentiometers. When the machine reaches its operating temperature, simply trigger the AutoZero function by shorting the designated calibration pins via a PLC digital relay or switch. The internal digital circuit instantly recalibrates zero pressure to account for thermal expansion shifts.
Q2: What is the benefit of a SIL2 compliant melt pressure transmitter? A: SIL2 (Safety Integrity Level 2) compliance indicates that the transmitter has been engineered and tested to satisfy functional safety standards for risk reduction. In automated extrusion lines, a SIL2-rated sensor ensures high diagnostic reliability, making it suitable for safety shutdown systems designed to prevent dangerous overpressure conditions.
Q3: How does digital linear compensation improve performance compared to standard analog transmitters? A: Standard analog transmitters use passive components that can drift slightly with ambient temperature variations. The MPES Series uses a digital processing circuit that actively linearizes the pressure signal and compensates for temperature variations, resulting in tighter accuracy and enhanced long-term stability.
Q4: Which series should I choose between the MP, MPE, and MPES? A: Select the MPES Series if your system requires automated PLC zeroing, SIL2 safety compliance, or high-precision digital compensation. Choose the MP Series for standard budget-conscious replacement of legacy analog sensors, and select the MPE Series if you require a mercury-free, food/pharma compliant sensor operating up to 700°C.
