Elster CT30 UC1-121B375992000 Pressure Sensor

The Elster CT30 UC1-121B375992000 (Internal Part/Serial Identifier: 3021524301000020) is an industrial-grade, intrinsically safe capacitive ceramic pressure sensor transducer engineered specifically for high-accuracy gas volume correction systems. Designed by Elster GmbH (now Honeywell Process Solutions / Elster-Instromet), the CT30 series provides dynamic pressure compensation to convert actual measured line volume into normalized base volume within custody-transfer and critical process environments.

Equipped with a solid-state ceramic measuring cell the CT30 operates without internal hydraulic transmission fluids, completely eliminating oil leakage risks and minimizing temperature-induced drift. In marine dual-fuel engines (LNG/LPG supply skids), inert gas systems (IGS), boil-off gas (BOG) compressors, and offshore fiscal metering skids, this transducer guarantees long-term stability and resistance to aggressive media, high line pulsations, and mechanical vibration.

Model Details

• Manufacturer: Elster GmbH / Honeywell Process Solutions
• Transducer Series: CT30 (ENVEC CT30 capacitive measuring cell)
• Full Model Code: UC1-121B375992000
• Manufacturing Part Number (MPN) / Matrix ID: 3021524301000020
• Internal Firmware/Hardware Classification: Type CT30 Pressure Sensor Assembly (Sel.p = 1 / CT30 protocol)
• Sensing Principle: Dry Capacitive Ceramic Cell

Technical Details

Features

1. Dry Ceramic Capacitive Cell: No fill fluid (silicon oil-free); immune to diaphragm rupture contamination and thermal hysteresis common in oil-filled piezoresistive cells.
2. Low-Power Bus Interfacing: Designed specifically to run directly off internal lithium battery packs (3.6 V) or intrinsically safe isolated loops in standalone field electronic volume converters (EVCs).
3. High Overpressure Safety: Built to sustain severe hydraulic/pneumatic hammer pulses up to four times the nominal working pressure range without calibration shift.
4. Hermetic & Intrinsically Safe Construction: Fully potted internal conditioning electronics certified for ATEX/IECEx Zone 1 and Zone 2 hazardous gas atmospheres.
5. High-Precision Digital Output: Communicates via a low-frequency synchronized bus directly to the converter processing board, avoiding secondary analog A/D drift.

Applications

• Marine Gas Fuel Supply Systems (FGSS): Pressure tracking for LNG/LPG dual-fuel marine engine feed blocks and gas valve units (GVU).
• Boil-Off Gas (BOG) Re-liquefaction & Handling: Accurate pressure compensation across cargo compressors and vapor recovery manifolds on gas carriers.
• Fiscal & Custody Transfer Metering: Paired with turbine, rotary, or ultrasonic gas meters to satisfy PTZ, PT, and MID compliance standards (EN 12405-1).
• Inert Gas Systems (IGS) & Nitrogen Generation Skids: Monitoring distribution manifolds aboard chemical and oil tankers.
• Industrial Gas Regulating & Measuring Stations (GMRS): High-reliability pressure logging for natural gas, biomethane, and non-corrosive industrial fuel gases.

Compatibility

• Elster Volume Converters: Direct fit for Elster EK220, Elster EK205, and EK205-M volume converters.
• Elster Flow Computers: Selected configurations of Elster-Instromet FC2000 and enCore systems supporting remote CT30 digital transducer inputs.
• Gas Flow Meters: Compatible with pulse outputs from Elster RABO, TRZ 2, SM-RI-X, QA, and QAE rotary and turbine gas meters running custody measurement circuits.

Frequently Asked Questions

What does the Elster CT30 UC1-121B375992000 measure?

The CT30 UC1-121B375992000 is an absolute or gauge pressure transmitter designed to provide continuous, high-accuracy gas pressure data to an Elster electronic volume converter (such as the EK220 or EK205). This allows the converter to calculate real-time gas compressibility and compute standardized volume under base conditions.

Can I replace an existing CT30 sensor with this unit without full converter replacement?

Yes. The CT30 is a field-replaceable modular sensor assembly. Once installed on the impulse line, the converter must be unlocked (via calibration switch/password) and configured to recognize the new transducer’s factory calibration parameters using Honeywell/Elster enSuite software or keypad input.

What is the advantage of a capacitive ceramic sensor over a piezoresistive sensor?

Ceramic measuring cells operate dry, eliminating silicone oil fills. They exhibit high chemical resistance, zero oil-leaking hazard into gas pipelines, exceptional overpressure withstand capabilities, and minimal hysteresis over extreme temperature ranges.

Is this sensor suitable for hazardous classified areas on ships and offshore rigs?

Yes. The CT30 sensor assembly holds ATEX and IECEx intrinsically safe certifications (Ex ia), allowing it to operate in Zone 1 and Zone 2 hazardous process zones when hooked up through the intrinsically safe circuits of certified equipment like the EK205/EK220.

What impulse line fitting is standard on the CT30?

The CT30 is typically furnished with an Ermeto 6L compression fitting intended for 6 mm outer diameter precision stainless steel tubing, or an industrial G 1/4″ external connection depending on the adapter manifold fitted.