Differential Level Transmitter
Differential pressure transmitter Pressure Transmitter
Differential Pressure Transmitter
Differential Pressure

Pressure Level Transmitter

Price range: $ 1,201.20 through $ 2,322.32

Pressure Level Transmitters accurately measure liquid level using hydrostatic pressure.
Ideal for tanks, reservoirs, sumps, and process vessels. Available in submersible and rod-mounted designs with stainless steel or Hastelloy construction.
Reliable, low-maintenance, and cost-effective solution with 4-20mA/HART output.

SKU: 13000 Categories: , , , Tags: , , , , , , , , , Brand:

Description

Pressure Level Transmitters (also known as hydrostatic level transmitters) measure liquid level by detecting the pressure exerted by the liquid column above the sensor. They are reliable, cost-effective, and widely used in tanks, reservoirs, rivers, and process vessels.

Category Key Features Technical Specifications
Working Principle Hydrostatic pressure measurement (P = ρgh) Gauge or Absolute pressure sensors
Types Submersible, Rod-type, Flush diaphragm, Capacitive, Ceramic sensor 4-20mA, HART, Modbus, Wireless
Materials 316L Stainless Steel, Titanium, Hastelloy, Ceramic diaphragm IP68 / NEMA 6P protection
Performance High accuracy, Excellent long-term stability, Temperature compensation Accuracy: ±0.1% to ±0.5% FS
Range: 0–0.5m up to 200m

Key Benefits

Category Key Benefits
Reliability ✔ No moving parts – highly reliable
✔ Excellent long-term stability
✔ Resistant to foam, vapor & turbulence
Versatility ✔ Suitable for aggressive chemicals & high temperatures
✔ Wide measuring range (cm to hundreds of meters)
✔ Easy installation (submersible or mounted)
Cost Effective ✔ Lower cost than radar or ultrasonic in many applications
✔ Minimal maintenance required

Applications & Support Services

Category Details
Common Applications Water & wastewater tanks, Chemical storage, Fuel & oil tanks, Rivers & open channels, Boreholes, Food & beverage silos
Installation & Commissioning Submersible drop-in or flange mounting, Zero & span calibration, HART configuration
Maintenance & Support Periodic calibration, Diaphragm cleaning, Spare parts & 24/7 technical support

Additional information

Weight 11 lbs
Dimensions 14 × 14 × 14 in
Connection end

Flanged, Threaded, Sanitary
Remote Diaphragm

No, Yes
Size

2", 3", 4"
Voltage

24VDC, 120VAC
Classification

Explosion Proof, intrinsically Safe
Display

Yes
Communication Protocol

HART
Output

4-20MA, 0-10VDC (Optional)
QC Test Certificate

No, Yes
Pressure Class

150LB
Media Type

Liquid
Temperature

< 251 °F, > 250 °F

Specifications

Parameter Specification
Measuring Principle Hydrostatic Pressure (P = ρ × g × h)
Measuring Range 0 – 0.5 m up to 0 – 200 m (custom ranges available)
Accuracy ±0.1% to ±0.5% of Full Scale
Output Signal 4-20 mA (2-wire), HART, Modbus RTU, RS485
Power Supply 12 – 36 VDC
Wetted Materials 316L SS, Titanium, Hastelloy C, Ceramic, PTFE
Temperature Range -20°C to +80°C (standard) / -40°C to +125°C (high temp)
Protection Rating IP68 / NEMA 6P (submersible)
Process Connection G1/2″, NPT, Flange, Submersible cable type
Approvals ATEX, IECEx, CE, FM, SIL 2 (optional)

Installation

Step Procedure
Preparation Verify transmitter range matches tank depth. Check all accessories (cable, mounting bracket, seals). Ensure power supply is off.
Mounting Submersible type: Lower sensor slowly to desired depth. Rod / Flange type: Install vertically on tank top with proper gasket.
Cabling Route cable through conduit. Avoid sharp bends. Seal cable entry to maintain IP68 rating. Connect wires per wiring diagram.
 Commissioning Apply power. Perform zero adjustment (tank empty). Span calibration at known level. Verify 4-20mA output.
Final Checks Check for leaks. Confirm stable reading. Secure cable to prevent pulling on sensor. Document installation.

Maintenance

Interval Procedure
Monthly Visual inspection of cable and mounting. Check for damage, corrosion, or fouling on sensor. Verify stable output reading.
Every 6 Months Clean sensor diaphragm with soft cloth and mild detergent. Remove any scaling or deposits. Check zero point in empty tank.
Annually Full calibration check using known reference levels. Test output signal accuracy. Inspect cable seals and junction boxes.
As Needed Replace damaged cable or O-rings. Clean heavy fouling with approved solvent. Re-calibrate after any repair.
Safety Notes Always isolate power before maintenance. Use proper PPE. Follow lock-out/tag-out procedures in hazardous areas.

Advantages / Disadvantages

Category Advantages Disadvantages
Performance ✔ High accuracy & stability
✔ Excellent for viscous & dirty liquids		 ✘ Affected by density changes
✘ Not suitable for pressurized closed tanks without compensation
Installation & Cost ✔ Simple & low-cost installation
✔ Very economical compared to radar/ultrasonic		 ✘ Requires regular cleaning in dirty media
✘ Submersible cable can be vulnerable
Maintenance ✔ No moving parts – highly reliable
✔ Easy calibration		 ✘ Diaphragm can foul or damage in abrasive liquids
✘ Cable damage requires full unit replacement

Applications

Industry Typical Applications Key Benefits
Water & Wastewater Lift stations, clarifiers, reservoirs, sewage tanks, river level monitoring Reliable in dirty & corrosive media, low maintenance
Chemical & Petrochemical Storage tanks for acids, solvents, fuels, and process vessels Compatible with aggressive chemicals using Hastelloy or ceramic sensors
Oil & Gas Crude oil tanks, fuel storage, separator vessels, offshore platforms Explosion-proof versions available, handles high viscosity
Food & Beverage Milk, juice, syrup tanks, brewing vessels, CIP systems Hygienic stainless-steel design, easy cleaning
Power Generation Boiler drums, cooling water basins, condensate tanks High temperature & pressure resistance
Agriculture & Irrigation Irrigation reservoirs, fertilizer tanks, rainwater harvesting Cost-effective for large open tanks

Q&A

Question Answer
How does a pressure level transmitter work? It measures the hydrostatic pressure created by the liquid column (P = ρ × g × h) and converts it into a level reading. The deeper the liquid, the higher the pressure.
What is the typical measuring range? Standard ranges go from 0–0.5 m up to 0–200 m. Custom ranges are available for specific tank heights.
Can it be used in pressurized tanks? Yes, but you need a differential pressure transmitter or vented cable version to compensate for the pressure above the liquid.
Is it suitable for corrosive chemicals? Yes. Models with Hastelloy, Titanium, or Ceramic diaphragms are ideal for strong acids and caustics.
How often should it be calibrated? Typically every 6–12 months in clean liquids, and every 3–6 months in dirty or aggressive media.
What output signals are available? 4-20mA (2-wire), HART, Modbus RTU, and wireless options are available.
Can it handle high temperature liquids? Yes. High-temperature versions can operate up to 125°C (257°F) or higher with special cooling extensions.
Is submersible installation difficult? No. Simply lower the sensor into the tank and secure the cable. It is one of the easiest level measurement methods to install.
Does foam or turbulence affect accuracy? Minimal effect compared to ultrasonic or radar. A stilling well or dampening can be used in very turbulent applications.
What maintenance is typically required? Periodic cleaning of the diaphragm and cable inspection. No moving parts mean very low maintenance compared to float or mechanical devices.

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