^{User Manual}

^{Foxboro 841GX-CI1 Pressure Transmitter}

^{Prepared exclusively for:Easy Semiconductor Technology (Hong Kong) Limited}

^{1. Product Overview}

^{1.1 General Description}

^{The Foxboro 841GX-CI1 is a high-performance, 2-wire, loop-powered electronic gauge pressure transmitter. Designed for precise, stable measurement of gauge pressure in industrial process environments, it converts physical pressure into a proportional 4–20 mA DC electrical signal for monitoring and control systems.}

• ^{Brand: Foxboro (Schneider Electric / Invensys)}

• ^{Model: 841GX-CI1}

• ^{Type: Gauge Pressure Transmitter}

• ^{Output: 4–20 mA DC (2-wire loop)}

• ^{Power Supply: 12.5–36 V DC (loop-powered)}

• ^{Wetted Parts: 316L Stainless Steel}

• ^{Enclosure: NEMA 4X / IP66 (aluminum, epoxy-coated)}

^{1.2 Key Features & Benefits}

• ^{High Accuracy & Stability: ±0.1% of span typical performance}

• ^{Wide Pressure Range: Adjustable from 7.5 to 3000 PSI}

• ^{Rugged Construction: 316L SS sensor for corrosion resistance}

• ^{Loop-Powered Design: Simplified wiring, low power consumption}

• ^{Compact, Lightweight: Direct process mounting}

• ^{Industrial Certifications: CE, UL, RoHS compliant}

• ^{Wide Temp Range: -40°C to +85°C operating temperature}

^{1.3 Typical Applications}

• ^{Semiconductor manufacturing & cleanroom pressure control}

• ^{Petrochemical, chemical, and pharmaceutical processing}

• ^{Oil & gas production, refining, and pipeline monitoring}

• ^{Power generation (boilers, turbines, compressors)}

• ^{Water treatment, HVAC, and industrial automation}

^{2. Safety & Installation Preparations}

^{2.1 Safety Warnings}

• ^{WARNING: Risk of explosion if installed in hazardous areas. Use only in approved classified locations.}

• ^{WARNING: Disconnect power before wiring, installation, or maintenance.}

• ^{WARNING: Ensure process pressure is relieved before removing the transmitter.}

• ^{CAUTION: Do not exceed maximum pressure or temperature ratings.}

• ^{CAUTION: Use proper tools and follow local electrical codes (NEC, IEC, etc.).}

^{2.2 Unpacking & Inspection}

1. ^{Remove the transmitter from packaging.}

2. ^{Inspect for physical damage (dents, cracks, loose parts).}

3. ^{Verify model number: 841GX-CI1.}

4. ^{Confirm included accessories:}

• ^{Mounting hardware}

• ^{1/2 NPT conduit plug}

• ^{Product label & calibration sheet}

^{2.3 Tools Required}

• ^{13/16-inch (or 21 mm) wrench}

• ^{Screwdriver (flat / Phillips)}

• ^{Pressure calibrator (for setup)}

• ^{Multimeter (4–20 mA measurement)}

• ^{Proper grounding cables}

^{3. Mechanical Installation}

^{3.1 Mounting Location}

• ^{Mount in a location with minimal vibration and temperature extremes.}

• ^{Protect from direct sunlight, rain, and corrosive fumes.}

• ^{Ensure easy access for wiring, calibration, and maintenance.}

^{3.2 Process Connection}

• ^{Process Connection: 1/2–14 NPT male (standard)}

• ^{Apply thread sealant (non-hardening) to male threads.}

• ^{Tighten securely using a wrench on the hex base (not the electronics housing).}

• ^{Ensure proper alignment to avoid mechanical stress.}

^{3.3 Conduit & Wiring Entry}

• ^{Use 1/2 NPT conduit connections.}

• ^{Seal conduits to maintain NEMA 4X / IP66 protection.}

• ^{Route cables away from high-voltage power lines to avoid EMI/RFI interference.}

^{4. Electrical Installation}

^{4.1 Wiring Diagram (2-Wire Loop)}

1. ^{Power Supply (+) → Transmitter Terminal (+)}

2. ^{Transmitter Terminal (–) → Controller/PLC Input (–)}

3. ^{Ensure a clean instrument ground for the shield.}

4. ^{Use twisted-pair, shielded cable (22–18 AWG).}

^{4.2 Terminal Connections}

• ^{Open the electronics housing cover.}

• ^{Identify terminals: + (positive), – (negative).}

• ^{Securely fasten wires; avoid loose connections.}

• ^{Replace cover and tighten screws to maintain environmental seal.}

^{4.3 Grounding}

• ^{Connect cable shield to a single-point instrumentation ground.}

• ^{Do not ground at multiple points (prevents ground loops).}

^{5. Commissioning & Calibration}

^{5.1 Power-Up}

• ^{Apply 12.5–36 V DC to the loop.}

• ^{After ~5 seconds, the transmitter outputs 4 mA (zero pressure).}

^{5.2 Zero & Span Calibration}

1. ^{Zero Calibration (0%):}

• ^{Apply zero pressure to the sensor.}

• ^{Adjust zero potentiometer until output = 4.00 mA.}

2. ^{Span Calibration (100%):}

• ^{Apply full-scale pressure (e.g., 1000 PSI).}

• ^{Adjust span potentiometer until output = 20.00 mA.}

3. ^{Repeat steps 1–2 for best accuracy.}

^{5.3 Verification}

• ^{Test at 0%, 50%, 100% of range.}

• ^{Confirm linearity and error within ±0.1% of span.}

^{6. Operation & Maintenance}

^{6.1 Normal Operation}

• ^{The transmitter operates continuously once calibrated.}

• ^{Output signal: 4 mA = 0% pressure, 20 mA = 100% full scale.}

• ^{No routine adjustments required under stable conditions.}

^{6.2 Routine Maintenance}

• ^{Inspection: Every 3–6 months}

• ^{Check for leaks, corrosion, or physical damage.}

• ^{Tighten conduit and housing seals.}

• ^{Cleaning: Wipe housing with a soft, dry cloth.}

• ^{Calibration Check: Annually or after process disturbance.}

^{7. Specifications}

^{7.1 Performance}

• ^{Accuracy: ±0.1% of span (typical)}

• ^{Stability: ±0.1% per year}

• ^{Response Time: < 100 ms}

• ^{Temperature Effect: ±0.02% / °F}

^{7.2 Electrical}

• ^{Supply Voltage: 12.5–36 V DC}

• ^{Output: 4–20 mA DC (2-wire)}

• ^{Reverse Polarity Protection: Yes}

^{7.3 Environmental}

• ^{Operating Temp: -40°C to +85°C (-40°F to +185°F)}

• ^{Storage Temp: -50°C to +121°C (-58°F to +250°F)}

• ^{Humidity: 0–100% RH}

• ^{Enclosure Rating: NEMA 4X / IP66}

^{7.4 Physical}

• ^{Wetted Material: 316L Stainless Steel}

• ^{Process Connection: 1/2–14 NPT male}

• ^{Weight: ~1.0 kg (2.2 lbs)}

^{8. Warranty & Support}

^{8.1 Warranty}

• ^{Warranty Period: 12 months from delivery.}

• ^{Covers defects in materials and workmanship under proper use.}

• ^{Exclusions: Damage from misuse, improper installation, overpressure, or unauthorized repair.}

^{8.2 Support Contact}

^{Easy Semiconductor Technology (Hong Kong) Limited}

• ^{Address: Hong Kong, China}

• ^{Support Email: support@hongkongeasy.com}

• ^{Website: www.hongkongeasy.com}