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Industrial 4-20mA Pressure Transmitter Sensor For Gas/Liquid Measurement

Specifications

Delivery Time :

5-8 working days

Output Signal :

4-20mA (2-wire) / 0-10V / RS485 Modbus optional

Housing Material :

304 Stainless Steel (316L optional)

IP Rating :

IP65

Accuracy :

0.5%FS (0.25%FS high-precision optional)

Place of Origin :

China

Payment Terms :

T/T,L/C,Western Union

Supply Ability :

500 Sets/Month

Process Connection :

G1/4, G1/2, M20x1.5, 1/2 NPT

Operating Temperature :

-20°C to +85°C

Power Supply :

24VDC (12-36VDC)

Certification :

CE, ISO9001

Price :

Negotiable

Packaging Details :

Carton with foam padding / wooden box

Measurement Range :

0~0.6 bar to 0~600 bar (customizable)

Model Number :

QWP-2088

MOQ :

1 Set

Brand Name :

QINWEIYB

Description

Are You Facing These Industrial Pressure Measurement Problems?

Process downtime from sensor drift — cheap pressure transmitters drift over time, giving false readings that cause pump failures, valve malfunctions, and unexpected production shutdowns.
Sensor failure in wet or dusty environments — standard transmitters without proper sealing fail prematurely from moisture ingress, dust infiltration, and condensation in industrial settings.
Inconsistent readings across multiple measurement points — using mismatched sensors from different suppliers leads to data inconsistency that undermines your process control system.
High replacement frequency — low-quality sensors fail after 6-12 months, creating recurring procurement costs and maintenance labor you didn't budget for.
Compatibility headaches — non-standard output signals or process connections force you to buy adapters, signal converters, and custom fittings that inflate total installation cost.

Operating Environment Analysis

Selecting the right pressure transmitter demands a thorough understanding of your operating environment. Below is the complete application profile:

Industries Served	Factory automation, water/wastewater treatment, HVAC systems, hydraulic/pneumatic systems, pump stations, food & beverage processing, pharmaceutical manufacturing, textile machinery
Measured Media	Water, compressed air, hydraulic oil, lubricating oil, diesel fuel, natural gas, nitrogen, steam condensate, and other clean non-corrosive gases/liquids
Temperature Range	-20°C to +85°C (-4°F to +185°F) — suitable for indoor and sheltered outdoor installations in temperate and tropical climates
Pressure Range	0–0.6 bar to 0–600 bar gauge/absolute/sealed gauge; custom ranges available on request
Corrosivity	Rated for non-corrosive to mildly corrosive media; 316L stainless steel diaphragm option available for enhanced corrosion resistance
Viscosity	Low to medium viscosity clean fluids; not suitable for high-sediment slurries, crystallizing fluids, or media with solid particles >100 µm
Installation Conditions	Direct process mounting via standard threaded connection; IP65 rated for dust-tight and water-jet resistant outdoor installation with proper cable gland sealing

Why Traditional Solutions Fall Short

Many procurement professionals have experienced the limitations of conventional pressure measurement approaches:

Mechanical Bourdon Tube Gauges	No electrical output signal — cannot integrate with PLC/DCS/SCADA systems; require manual reading; no alarm capability; mechanical wear causes accuracy degradation over time.
Low-Cost Unbranded Transmitters	Poor temperature compensation leads to measurement drift of 2–5% per year; lack proper EMC protection causing signal instability near VFDs and motors; unreliable after-sales support.
Piezoresistive Sensors Without Isolation	Sensing element directly exposed to media without isolation diaphragm — vulnerable to contamination, clogging, and corrosion; short service life in real industrial conditions.
Wireless Consumer-Grade Sensors	Limited to short-range Bluetooth/Wi-Fi (10–50m effective range); unsuitable for industrial environments with metal structures; battery replacement every 2–3 months increases TCO.
Manual Pressure Gauges with Operator Rounds	Labor cost of sending operators to read gauges throughout the plant; no data logging for trend analysis; cannot trigger automated safety interlocks or alarms.

QWP-2088: The Reliable 4-20mA Industrial Pressure Transmitter

The QWP-2088 is a general-purpose industrial pressure transmitter engineered for continuous, stable pressure measurement in demanding factory environments. Built around a piezoresistive silicon sensing element with a 316L stainless steel isolation diaphragm, it converts gas or liquid pressure into a precise 4–20mA analog signal — the global standard for industrial process control. The IP65-rated 304 stainless steel housing ensures long-term reliability in wet, dusty, and vibration-prone environments.

Core Capabilities at a Glance:

Wide pressure range — covers 0.6 bar to 600 bar in gauge, absolute, and sealed gauge configurations
Industry-standard 4–20mA output — plug-and-play with all major PLC, DCS, and SCADA systems without signal converters
0.5%FS accuracy — with optional 0.25%FS high-precision version for critical process control applications
Robust IP65 stainless steel housing — withstands water jets, dust, vibration, and outdoor exposure
Multiple process connections — G1/4, G1/2, M20*1.5, 1/2 NPT to fit your existing pipework without adapters
Optional RS485 Modbus / 0–10V output — for direct digital integration with modern IoT platforms

Technical Advantages

Piezoresistive Silicon Sensor	Proven MEMS technology with excellent linearity and repeatability; temperature-compensated from -20°C to +85°C for stable readings across wide ambient conditions.
316L SS Isolation Diaphragm	Protects the sensing element from direct media contact while transmitting pressure accurately; resistant to mild corrosion and compatible with most industrial fluids.
Full EMC Protection	Built-in surge protection, reverse polarity protection, and IEC 61000-4 compliant EMI/RFI filtering — stable signal even near VFDs, motors, and welding equipment.
Wide Power Supply Range	Operates on 12–36 VDC with built-in voltage regulation; tolerant of unstable plant power without signal degradation.
Long-Term Stability	Drift of ≤0.2%FS per year under normal conditions — minimizing recalibration frequency and lifecycle maintenance costs.
Response Time ≤10ms	Fast enough for real-time control loops, hydraulic system monitoring, and automated safety shutdown sequences.

Quick Process-Thread Installation

The QWP-2088 is designed for direct threaded mounting into standard process connections. Unlike complex flange-mounted instruments, installation requires only basic tools and takes minutes:

Step 1 — Verify Thread Match	Confirm that your process connection matches the transmitter's G1/4, G1/2, M20x1.5, or 1/2 NPT thread. Use a compatible sealing gasket or PTFE tape.
Step 2 — Thread & Torque	Screw the transmitter into the process port hand-tight, then apply the recommended torque with a wrench. Do not over-torque — the metal-to-metal seal requires only moderate pressure.
Step 3 — Cable & Power Wiring	Connect the 2-wire cable: Red to 24VDC+, Black to signal input on PLC/DCS. Ensure the cable gland is properly tightened to maintain IP65 protection.
Step 4 — Zero Calibration Check	With the system at zero pressure (vented to atmosphere), verify the output reads 4.00mA. Adjust zero trim if necessary via the accessible potentiometer or digital interface.
Step 5 — System Verification	Apply known process pressure and confirm the 4–20mA output matches. The transmitter is now ready for continuous operation.

Typical installation time: under 30 minutes from unboxing to operational. No specialized calibration equipment required for standard accuracy applications.

Real-World Application Cases

Case 1: Municipal Water Pump Station Pressure Monitoring

Industry	Municipal Water Supply
Measured Media	Treated potable water
Temperature	+5°C to +30°C
Pressure	0–16 bar (discharge pressure monitoring)
Installation Environment	Underground pump station with 85% RH humidity, occasional condensation
Customer Problem	A city water utility used mechanical Bourdon tube gauges across 12 pump stations. Operators drove between stations twice daily to log readings manually. No automated alarm existed for low discharge pressure, which went undetected for 6+ hours during one incident, causing widespread service disruption.
Solution	Deployed 36 QWP-2088 transmitters (3 per station: suction, discharge, and header pressure) integrated with the existing PLC network via 4–20mA analog input cards.
Installation Location	Threaded into existing G1/2 pressure ports on pump suction, discharge, and distribution headers
Result	Real-time pressure monitoring across all 12 stations from a single SCADA control room. Automatic SMS alerts on pressure deviation. Eliminated 24 daily operator trips, saving an estimated $48,000/year in labor and fuel. Payback period: 4 months.

Case 2: Food Processing Compressed Air System Optimization

Industry	Food & Beverage Processing
Measured Media	Compressed air (filtered, dried)
Temperature	+10°C to +50°C
Pressure	0–10 bar
Installation Environment	Indoor compressor room and production floor distribution lines
Customer Problem	A snack food manufacturer experienced frequent production line stops due to compressed air pressure drops below 5.5 bar. Existing pressure switches only gave on/off alarms at 5 bar, providing no trend data to identify the root cause. The maintenance team suspected piping leaks but couldn't quantify the loss.
Solution	Installed 8 QWP-2088 transmitters at compressor outlet, receiver tank, and each main distribution branch. 4–20mA signals fed to a central data acquisition system for continuous trend logging.
Installation Location	G1/4 threaded ports on compressor outlets, receiver tank, and distribution manifolds
Result	Trend data revealed a 22% pressure drop across a poorly sized filter-regulator station serving the packaging line. After replacing the undersized unit, line pressure stabilized above 6.2 bar. Production stops due to low air pressure dropped to zero. Compressor runtime reduced by 14% as leaks were identified and repaired based on trend analysis.

Frequently Asked Questions

Q1: What pressure ranges are available for the QWP-2088?

Standard ranges span from 0–0.6 bar (0–9 psi) to 0–600 bar (0–8,700 psi) in gauge pressure. Absolute pressure and sealed gauge versions are also available. Custom ranges can be factory-calibrated to your exact requirements — specify your range when inquiring.

Q2: Can this transmitter measure both gas and liquid pressure?

Yes. The QWP-2088 is compatible with both gases (compressed air, nitrogen, natural gas) and liquids (water, hydraulic oil, diesel). The 316L stainless steel diaphragm provides excellent media compatibility across both phases.

Q3: How does the 4–20mA output connect to my PLC?

The 2-wire 4–20mA loop is the universal industrial standard. Connect the transmitter in series with a 24VDC power supply and your PLC analog input card. No signal conditioners, amplifiers, or converters are needed. Detailed wiring diagrams are included with every unit.

Q4: What is the difference between 0.5%FS and 0.25%FS accuracy versions?

The 0.5%FS version meets the needs of 90% of industrial applications (pump control, filter monitoring, level measurement). The 0.25%FS version is recommended for custody transfer, precision injection molding, hydraulic test stands, and laboratory calibration applications where tighter tolerances are required.

Q5: Is the transmitter protected against electrical surges?

Yes. The QWP-2088 includes built-in surge protection, reverse polarity protection, and EMI/RFI filtering compliant with IEC 61000-4 standards. It can operate reliably in electrically noisy environments alongside VFDs, motors, and switching equipment.

Q6: What is the expected service life?

Under normal operating conditions (within specified temperature, pressure, and media limits), the QWP-2088 is designed for 5–7 years of continuous service. Annual calibration verification is recommended for critical applications to maintain specified accuracy.

Q7: Can I get a sample unit for testing before placing a bulk order?

Yes. We offer sample units at a discounted price for evaluation and qualification. Samples typically ship within 3 working days. After successful testing, bulk pricing is applied retroactively to your sample purchase on qualifying orders.

Q8: What is the minimum order quantity and lead time for bulk orders?

Minimum order quantity is 1 set for initial orders. Standard delivery is 5–8 working days. For bulk orders of 50+ units, typical lead time is 2–4 weeks depending on custom configuration requirements.

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