Industrial Vacuum & Low-Pressure Transducer (Aviation Socket, -40°C to 150°C)
Stop struggling with unstable vacuum readings in hot or space-constrained environments. The PM4233 Vacuum Transducer is purpose-built for low-pressure ranges (starting down to -0.1 MPa / -1 Bar) and engineered to withstand elevated process temperatures from -40°C to +150°C.
Equipped with a heavy-duty, vibration-resistant Aviation Socket and a high-precision 316L Stainless Steel diaphragm, the PM4233 delivers a rock-solid, noise-immune 4–20mA or 0–10V signal to your PLC or controller.
-
Wide Working Temperature: -40°C to +150°C (with optional customizable cooling fins)
-
Ultra-low Vacuum Resolution: Perfect for accurate detection starting at -0.1 MPa (-1 Bar)
-
Rugged Connection: Mil-spec aviation socket prevents loose wiring in high-vibration plants
-
Corrosion Resistant: Wet parts constructed from highly durable 316L Stainless Steel
-
Rapid Response Time: ≤1 ms response for dynamic vacuum regulation
Description
Maintaining stable, drift-free vacuum pressure in industrial process loops is a persistent challenge for plant engineers. Standard piezoresistive pressure transmitters frequently fail, drift, or lose calibration when exposed to elevated process temperatures or continuous mechanical vibration.
The PM4233 Vacuum Transducer is engineered specifically to bridge this gap. Optimized for low-pressure ranges starting down to absolute vacuum (-0.1 MPa / -1 Bar), this heavy-duty transmitter delivers precision monitoring across a wide operational temperature envelope of -40°C to +150°C. By pairing a specialized, high-accuracy silicon die with a media-isolated 316L Stainless Steel diaphragm and a ruggedized Aviation Plug interface, the PM4233 ensures your PLC receives an uninterrupted, noise-immune feedback signal under conditions that compromise standard sensors.
Common Applications
-
Petrochemical & Refining: Monitoring gas pressure in hazardous distillation processes.
-
Industrial Automation & HVAC: Precise vacuum regulation in vacuum pumps and HVAC compressors.
-
Power & Metallurgy: High-vibration turbine oil systems and steam line pressure monitoring.
-
Environmental Technology: Low-pressure draft monitoring in combustion chimneys and scrubbers.
Wiring Guide & Electric Connections
The PM4233’s aviation socket simplifies cabinet integration:
-
For 4–20mA (2-Wire Loop):
-
Pin 1: Power supply positive (V+)
-
Pin 2: Signal positive (S+ / Current Loop back to PLC analog input)
-
Pin 4: Ground (Shield/GND)
-
-
For 0–10V (3-Wire Voltage):
-
Pin 1: Power supply positive (V+)
-
Pin 2: Power supply common negative (V-)
-
Pin 3: Signal output positive (S+)
-
Pin 4: Ground (GND)
-
How to Order Your Customized PM4233
To receive an exact quote or discuss specific options, please specify your required code configuration:
Model (PM4233) — Pressure Type — Pressure Range — Accuracy — Wetted Material — Process Thread — Output Signal
Ordering Code Breakdown Options:
-
Model Designation:
PM4233 -
Pressure Type:
G(Gauge Pressure),A(Absolute Pressure),S(Sealed Gauge) -
Pressure Range: Specify required limits (e.g.,
-0.1~0 MPa,-1~5 Bar,0~10 kPa) -
Accuracy Rating:
T(0.25% FS Typical),M(0.5% FS Max),P(0.1% FS High-Precision) -
Wetted Material:
L(316L Stainless Steel Diaphragm) -
Process Connection Thread:
M20(M20×1.5),G1/2(G1/2″),G1/4(G1/4″),N1/2(1/2″ NPT),N1/4(1/4″ NPT) -
Electrical Output Interface:
MA(4–20mA),V10(0–10V),V5(0–5V),R485(RS485 Modbus)
Example Configuration String:
PM4233—A—(-0.1~0 MPa)—T—L—G1/2—MAThis specific part string represents: PM4233 series aviation socket transmitter, Absolute Pressure reference, -0.1 to 0 MPa total vacuum measurement span, 0.25% typical accuracy class, 316L stainless steel wetted parts, G1/2″ BSPP male process thread, and a standard 2-wire 4–20mA analog output loop.
Features
-
Extended Media Temperature Envelope (-40°C to +150°C): Unlike conventional transmitters that suffer internal electronic degradation above 80°C, the PM4233 utilizes advanced internal temperature compensation up to 150°C. For extreme thermal processing lines, custom external cooling fins can be integrated to safely dissipate process heat before it encounters the sensing element.
-
Mil-Spec Aviation Socket Electrical Connection: Traditional plastic Hirschmann (DIN 43650) or Packard connectors can crack, embrittle, or back out under intense mechanical vibration. The PM4233 features a threaded, secure metal aviation socket that mechanically locks the cable in place, providing absolute continuity and acting as a shield against heavy industrial electromagnetic interference (EMI/RFI).
-
Corrosion-Proof 316L Stainless Steel Isolation Diaphragm: The wetted parts are precision-machined from 316L stainless steel, providing robust compatibility with aggressive gases, oils, steam, and corrosive process liquids.
-
Excellent Dynamic Response (≤1 ms): Rapid response times ensure instantaneous detection of vacuum drops, allowing for precise real-time regulation via variable frequency drives (VFDs) or automated vacuum release valves.
-
Negligible Thermal Zero Drift: Advanced internal compensation minimizes thermal drift to ≤± 0.03% FS/°C, guaranteeing that seasonal ambient temperature swings or process spikes do not compromise your measurement accuracy.
Specification
| Parameter | Specification Details |
| Pressure Range | -0.1 MPa … 0 kPa to 10 kPa … 100 MPa (Vacuum to High Pressure) |
| Pressure Type | Gauge Pressure (G), Absolute Pressure (A), Sealed Gauge (S) |
| Accuracy | 0.25% FS (Typical), 0.5% FS (Maximum), up to 0.1% FS (Custom Precision) |
| Output Signals |
4–20mA (2-wire loop), 0–10V, 0–5V, RS485 Modbus, I²C
|
| Response Time | ≤ 1 ms (10% to 90%) |
| Diaphragm / Wetted Parts |
316L Stainless Steel |
| Housing Material | 1Cr18Ni9Ti Stainless Steel |
| Operating Voltage | +12 to +36 VDC (24 VDC Standard) |
| Protection Rating | IP65 Standard (Upgradable to hermetically sealed IP68) |
| Process Thread Connection |
M20×1.5, G1/2″, G1/4″, 1/2″ NPT, 1/4″ NPT (Custom threads available) |
FAQ
Q1: Why should I select an Aviation Socket over a standard DIN 43650 (Hirschmann) connector for vacuum applications?
In vacuum systems operated near large industrial pumps, compressors, or mixing agitators, structural harmonics and high-frequency vibration are constantly present. Standard DIN connectors rely on a central friction-fit screw and a plastic housing. Over time, vibration causes these plastic housings to micro-wear, resulting in intermittent electrical contacts that register as signal spikes or “sensor drift” on your PLC analog card.
The PM4233’s threaded metal aviation socket creates a positive, locked mechanical coupling. It cannot vibrate loose, and the metal outer shell provides superior shielding against EMI/RFI noise generated by nearby variable frequency drives.
Q2: How does the PM4233 protect its internal sensor chip at high process temperatures up to 150°C?
Standard piezoresistive silicon chips experience severe thermal error and structural bonding degradation if exposed directly to process temperatures above 80°C. The PM4233 isolates the primary sensing element behind a flexible 316L stainless steel diaphragm. The internal cavity is filled with a highly stable, temperature-rated silicone oil that transfers pressure changes to the chip while isolating it from high thermal energy.
For continuous operation near the absolute upper threshold of 150°C, we recommend specifying our integrated cooling fin housing. These external fins maximize convective heat dissipation to the ambient air, dropping the internal oil temperature down into the optimal performance zone of the sensor chip.
Q3: Can this sensor handle absolute vacuum and positive pressure transitions within the same process?
Yes. The PM4233 can be built as a compound pressure transmitter (e.g., -0.1 MPa to +0.5 MPa). This is ideal for processes that alternate between deep vacuum purging cycles and positive-pressure gas backfilling or cleaning-in-place (CIP) cycles.
