ESM2088PS Series Intelligent Digital Display Hydraulic Pressure Transmitter
The ESM2088PS pressure transmitter is a highly sophisticated instrument designed for demanding industrial automation fields, particularly water treatment, municipal water supply, and firefighting network safety. Encased in a robust, explosion-proof cast aluminum housing, it features a dual-chamber structure that isolates delicate electronic circuits from external humidity, condensation, and environmental threats. Equipped with a high-grade 316L stainless steel isolation diaphragm and a diffused silicon piezoresistive core, this transmitter provides highly stable and precise measurements (0.2% to 0.5% FS accuracy) across ranges from -0.1 to 100 MPa. It is fully configurable with local LCD/LED visual displays and supports standard industry outputs such as 4-20mA, RS485 Modbus, and voltage signals.
Get Free Technical Consultation1. Pressure Monitoring Application Description
In modern urban infrastructure, water distribution networks are the lifelines of residential, commercial, and emergency operations. Maintaining optimal pressure is critical for system safety and resource conservation. Both tap water and firefighting pipeline systems operate under positive pressures relative to local atmospheric conditions, necessitating the use of gauge pressure transmitters.
Standard gauge transmitters measure pressure relative to ambient atmospheric pressure, ensuring that system readouts accurately reflect the stress on pipe walls. By converting physical pressure variations into standard electrical signals (such as 4-20mA or RS485 Modbus), these devices allow programmable logic controllers (PLCs), Remote Terminal Units (RTUs), and SCADA platforms to dynamically supervise pipeline health.
Tap Water Networks
Monitors pressure levels to guarantee constant supply across various elevations, preventing pipe bursts caused by sudden overpressure transients and avoiding contamination or low-flow issues due to negative pressure zones.
Firefighting Pipelines
Supervises standby pressure in wet pipe systems, deluge systems, and hydrant mains. Immediate low-pressure warnings trigger booster pumps to ensure adequate water volume and head pressure during emergency fire suppression operations.
2. Critical Installation Points in Piping Networks
Strategic placement of pressure transmitters ensures comprehensive coverage of pipeline dynamics, allowing operators to isolate issues and optimize pump control loops.
Tap Water Infrastructure
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Secondary Water Supply Pump Rooms: Located on the main outlet pipe header. Vital for variable frequency drive (VFD) constant-pressure feedback loops.
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Community Node Inlets: Installed at the main entry point of high-rise buildings or residential zones to monitor local pressure degradation.
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Elevated Water Tank Outlets: Placed at gravity-fed tank discharge lines to measure head pressure and calculate reservoir levels.
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SCADA Remote Telemetry Stations: Placed at key geographical junctions along municipal distribution mains to track pressure drops.
Fire Protection Systems
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Pressure Stabilizing Tank Outlet: Measures pressure downstream of jockey pumps to ensure the system remains pressurized.
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Hydrant System Main Pipe: Placed at base points of riser pipes to verify that manual firefighting connections meet minimum pressure codes.
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Automatic Sprinkler Wet Alarm Valves: Installed upstream and downstream of alarm valves to detect flow-induced pressure drops.
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Fire Pump Room Main Header: Placed directly at the discharge manifold of high-capacity emergency diesel/electric pumps.
3. Product Selection Guide for Water Pipelines
Pressure Range & Type
Always select Gauge Pressure (G) transmitters. Do not use absolute or differential types. Ensure the operational pressure sits within 60% to 70% of the maximum scale range to tolerate pressure spikes.
Secondary Supply: 0-1.0 MPa (10 bar)
Fire Systems: 0-1.6 MPa (16 bar) or 0-2.5 MPa (25 bar)
Output Signal & Interface
Choose 4-20mA current loop for long-distance analog transmission with high electromagnetic immunity. For automated digital networks, select RS485 Modbus RTU to enable multi-device daisy chaining and direct integration into IoT cloud gateways.
Materials & Protection
Standard tap water and firefighting lines are non-corrosive, but require robust mechanical build. Choose 316L stainless steel diaphragms to resist scale buildup. Ensure an IP65 or IP67 rating for damp pump rooms, sub-surface pits, and outdoor enclosures.
4. Intelligent Control Logic
Variable Frequency Constant Pressure Water Supply
The transmitter continuously reads pipeline discharge pressure and sends a 4-20mA signal to the VFD controller's PID loop.
When demand increases, pressure drops below the set target. The PID controller ramps up the VFD frequency, accelerating the pumps.
During low demand, pressure rises. The controller decreases pump speed or triggers sleep mode to prevent pipe damage and save energy.
Fire Protection Pressure Maintenance Loop
If minor leaks cause the network pressure to drop below the lower limit (e.g., 0.8 MPa), the jockey pump starts to stabilize the system.
Once pressure reaches the upper standby threshold (e.g., 1.0 MPa), the jockey pump stops to prevent over-pressurization.
If pressure falls past a critical threshold (e.g., 0.5 MPa), indicating a sprinkler discharge or hydrant operation, the main fire pump starts automatically, and a high-priority alarm is sent to the fire control host.
5. Troubleshooting Common Issues
Fluctuating and Unstable Pressure Readings
Cause: Transmitters installed too close to elbows, control valves, or pump discharge ports experience high turbulence.
Solution: Relocate the transmitter to a straight pipe section (minimum 5 pipe diameters downstream and 3 diameters upstream of any disturbance).
Sudden Sensor Failure (Diaphragm Rupture)
Cause: Water hammer caused by rapid valve closures or pump starts creates massive transient pressure waves.
Solution: Install a siphon loop, capillary tube, or dedicated water hammer arrestor (snubber) to dampen physical shocks.
Zero-Point Drift in Winter
Cause: Water inside the impulse pipe or transmitter chamber freezes, expanding and damaging the silicon diaphragm.
Solution: Wrap impulse lines with thermal insulation and electric tracing tape. Ensure the transmitter is housed in a heated enclosure if outdoors.
Loss of Signal / Intermittent Output
Cause: Moisture ingress through poorly sealed cable glands or loose conduit connections.
Solution: Ensure cable entry points face downward so water drips away. Apply thread sealant to conduit entries and tighten the packing gland securely.
6. Installation & Maintenance Best Practices
Use Isolation Valves
Always install a high-quality needle valve or three-way manifold block between the main pipeline and the transmitter. This allows isolation for calibration, maintenance, or replacement without shutting down the water network.
Proper Venting & Bleeding
When measuring liquid pressure, mount the transmitter below the pipe tap to prevent air pockets from trapping in the sensor chamber. Bleed trapped air from the line before commissioning to ensure accurate static readings.
Routine Calibration
Fire safety regulations demand high system reliability. Calibrate pressure transmitters annually using reference pressure calibrators. Document zero-point adjustments and span verifications to maintain compliance.
7. CE Certification & European Export Compliance
For pressure transmitters exported to the European Economic Area (EEA), CE marking is a mandatory regulatory requirement. It demonstrates that the product complies with EU health, safety, and environmental protection standards.
For industrial pressure transmitters like the ESM2088PS, compliance involves meeting three key European Directives:
- EMC Directive (2014/30/EU): Ensures the transmitter does not emit excessive electromagnetic interference and is immune to external electrical noise (important when installed near high-power VFDs).
- Pressure Equipment Directive (PED 2014/68/EU): Applies to equipment subjected to pressure above 0.5 bar. Ensures structural integrity of the housing and process connector.
- RoHS Directive (2011/65/EU): Restricts the use of hazardous substances in electronic components to protect public health and the environment.
Standard Compliance
Our transmitters are fully tested and certified under EN 61326-1 (EMC requirements for electrical equipment for measurement, control, and laboratory use).
Product Structure & Dimensions
Technical Specifications
| Parameter Name | Specification Details |
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| Measuring Range | -100 kPa ~ 0 ~ 100 MPa (customizable ranges available) |
| Measuring Medium | Gases, liquids, and steam compatible with 316L stainless steel |
| Accuracy Class | 0.25% FS / 0.5% FS |
| Output Signal | 4-20mA (with optional LED/LCD display); RS485 Modbus RTU; 0-10V; 0-5V |
| Supply Voltage | 12-30 VDC (typical 24 VDC) |
| Long-term Stability | ≤ 0.1% FS per year |
| Overload Capacity | 150% of full scale range |
| Operating Ambient Temp | -30°C to +85°C |
| Medium Temperature | Standard: -40°C to +85°C | High Temp Version: -40°C to +200°C |
| Process Connection | Thread (M20×1.5, G1/2, NPT1/2); Flange; Sanitary Clamp |
| Housing Protection Rating | IP65 (IP67 optional) |
| Explosion-proof Rating | Exia ⅡC T6 / Exd ⅡC T6 |
Xi'an ESM Tech Co., Ltd.
A leading manufacturer of high-precision sensors, navigation systems, and intelligent industrial instrumentation. We provide custom solutions engineered to perform under the most demanding conditions.
Address
Room 30113, Building 1, Longyuan International Building, Yuanshuo Road, Weiyang District, Xi'an, Shaanxi Province, China
