Siemens SITRANS CV 7KQ3105 Natural Gas Chromatograph

Condition: Used, Tested

Live Support

100% SECURED PAYMENTS
AVAILABLE IN STOCK - READY TO SHIP
EXPRESS DELIVERY: WORLDWIDE DELIVERY BY FEDEX & DHL EXPRESS COURIER
HASSLE FREE 14-DAY RETURNS

Siemens SITRANS CV 7KQ3105 Process Gas Chromatograph

The Siemens SITRANS CV (Order Code: 7KQ3105) is an explosion-proof, field-mounted online process gas chromatograph engineered specifically for the fiscal custody transfer, calorific value determination, and compositional analysis of natural gas. Combining high-precision micro-machined thermal conductivity detectors (MEMS TCD) with an optimized multi-column backflush analytical module, the SITRANS CV provides automated measurement of methane, ethane, propane, n-butane, iso-butane, neo-pentane, n-pentane, iso-pentane, hexane and heavier hydrocarbons, carbon dioxide, and nitrogen.

Designed for hazardous industrial, pipeline transmission, and marine offshore / LNG bunker duty, the 7KQ3105 performs complete hydrocarbon gas analysis within a typical 120- to 180-second cycle time without requiring an instrument air purge cabinet. All physical property calculations—including Gross/Net Calorific Value, Wobbe Index, Relative Density, Compressibility Factor, and Methane Number—are computed internally in accordance with ISO 6976, GPA 2172, and AGA-8 standards.

Model Details

Base Product Family: SITRANS CV Natural Gas Analyzer
Manufacturer: Siemens AG
Base Order Model Number (MLFB / MPN): 7KQ3105 (e.g., 7KQ3105-0, 7KQ3105-1, 7KQ3105-2, 7KQ3105-3 series)
Common Part Assemblies / Hardware Core: A5E00200000, A5E01428618, A5E00200002
Analytical Configuration: Standard C6+ Backflush or Extended C9+ Variant
Enclosure Variant: Flameproof Die-Cast Aluminum Enclosure with Window (Ex d [ib])

Technical Details

Parameter	Technical Specification
Analytical Measurement Range	CH4 (50–100%), C2H6 (0–15%), C3H8 (0–5%), n-C4H10 (0–1.8%), i-C4H10 (0–1.8%), n-C5H12 (0–0.5%), i-C5H12 (0–0.5%), neo-C5H12 (0–0.5%), C6+ (0–0.8% or 0–3%), N2 (0–15%), CO2 (0–15% or 0–20%), O2 optional
Repeatability / Precision	Calorific Value / Heating Value: ≤ ±0.1%; Component Mole Fraction: ≤ ±0.1% of measured value (meeting OIML R 140 Class A / ISO 10723)
Analysis Cycle Time	120 to 180 seconds (application dependent)
Detectors & Columns	High-sensitivity micro-machined Thermal Conductivity Detectors (MEMS TCDs); Capillary / Micropacked columns with live-switching / valveless column switching
Sample Streams	Up to 3 sample streams + 1 calibration stream (automated stream switching integrated)
Carrier Gas Supply	High-purity Helium (He ≥ 99.999%) or Argon (Ar ≥ 99.999%); Inlet pressure: 500 kPa ± 20 kPa (5.0 bar ± 0.2 bar / 72.5 psi ± 3 psi); Consumption: ~30 to 45 ml/min
Sample Gas Inlet Conditions	Pressure: 60 kPa to 200 kPa abs (0.6 to 2.0 bar / 8.7 to 29 psi); Flow rate: 20 to 50 ml/min; Temperature: Dew point ≤ -10°C below ambient; Particulate filtration ≤ 2 μm
Power Supply Ratings	18.0 to 30.0 V DC (Nominal 24 V DC); Inrush current: 5 A; Steady-state power consumption: 40 W to 60 W (ambient dependent)
Analog Outputs	4x 4–20 mA DC (electrically isolated, active/passive configurable, 12-bit resolution, max. loop load 500 Ω)
Digital / Relay Outputs	8x Relay contacts (SPST/SPDT, configurable for common fault, maintenance demand, stream active, cycle end, out-of-spec alarm); 30 V DC / 1 A, 125 V AC / 0.5 A
Digital Inputs	4x Optically isolated inputs for remote calibration start, stop, stream selection; Rated 24 V DC nominal (logic high: 15–30 V DC, logic low: 0–3 V DC)
Communication Protocols	1x Ethernet RJ45 (10/100 Base-T via internal Ex-certified conduit barrier) supporting TCP/IP, Modbus TCP; 2x RS485 / RS232 serial interfaces supporting Modbus RTU / ASCII (ASCII/RTU slave/master mode)
Terminal Allocation Details	Spring-loaded screw terminals (0.2 to 2.5 mm² / AWG 24–12): • TB1 (Power): Terminals 1 (L+ / +24V), 2 (M / 0V), 3 (PE / Chassis Ground) • TB2 (Serial Comms): Terminals 1 (RS485-A), 2 (RS485-B), 3 (Shield/GND), 4 (RS232-Tx), 5 (RS232-Rx), 6 (GND) • TB3 (Analog Outputs): Terminals 1–2 (AO1 +/-), 3–4 (AO2 +/-), 5–6 (AO3 +/-), 7–8 (AO4 +/-) • TB4 (Digital I/O & Relays): Terminals 1–8 (Relay channels K1 to K4), Terminals 9–16 (Digital Inputs DI1 to DI4)
Ambient Temperature Rating	-20°C to +55°C (-4°F to +131°F); Enclosure thermal stability managed via solid-state heating
Housing & Enclosure Material	Epoxy-coated copper-free die-cast aluminum (IP65 / NEMA 4X); 316L SS external hardware; Polycarbonate inspection glass
Pneumatic Connections	1/8″ Swagelok twin-ferrule compression fittings (Sample 1–3, Cal In, Carrier Gas In, Fast Loop Bypass, Sample Vent)
Weight & Dimensions	Approx. 340 mm (W) × 420 mm (H) × 265 mm (D); Weight: ~23 kg (50.7 lbs)

Compatibility

Flow Computers & EFM Devices: Direct Modbus RTU / TCP polling compatibility with Emerson FloBoss (107/S600+), OMNI 3000/6000, Spirit IT eXchange, and ABB Totalflow.
Distributed Control Systems (DCS) & PLCs: Fully mapable into Siemens SIMATIC S7-1500/PCS 7, Yokogawa CENTUM VP, Honeywell Experion PKS, and Rockwell ControlLogix architectures.
Marine Dual-Fuel Engines & GCU Integration: Direct methane number and lower heating value (LHV) transmission to Wärtsilä (50DF, 34DF, 20DF), MAN B&W ME-GI/ME-GA, and WinGD X-DF engine control systems to prevent engine knock during dynamic fuel gas blending.
Sample Conditioning Systems (SCS): Compatible with standard modular sample conditioning systems including Gen-Probe heated vaporizers, Coalescing membrane separators (A+ Corporation Genie 120/130 series), and Swagelok sample stream panels.

Applications

Fiscal Custody Transfer Stations: Boundary metering and custody transfer of natural gas at custody transfer border stations and city-gate metering skids.
Marine LNG Carriers & Dual-Fuel Bunkering: Measuring boil-off gas (BOG) composition, energy content, and calculating dynamic Methane Number to regulate ignition timing and prevent engine knocking in 2-stroke/4-stroke dual-fuel engines.
Pipeline Transmission & Underground Storage: Monitoring compressor stations, gas injection/withdrawal wells, and pipeline grid blending to verify calorific value continuity.
Gas-to-Power & Combined Cycle Power Plants (CCPP): Monitoring high-efficiency gas turbines (e.g., SGT-800, GE 7HA/9HA) to ensure fuel composition stability and protect against flash-back or blowout.

Part Number Cross-References

7KQ3105-0xxxx / 7KQ3105-1xxxx / 7KQ3105-2xxxx: Main Analyzer Assembly Series (SITRANS CV)
A5E00200000 / A5E00200002: Main Electronic Module / Processing PCB
A5E00150931: Analytical Column Module (C6+ Standard Separation Assembly)
A5E00216480: Micro-TCD Detector Bridge Array Kit
A5E00150942: Pneumatic Valve Assembly / Live Column Switch Block
A5E00803562: Internal Power Supply Unit (24 V DC Industrial Grade)
A5E01428618: Field Operating & Maintenance Manual Package

Frequently Asked Questions

Can the SITRANS CV 7KQ3105 be installed outdoors without an analyzer shelter?

Yes. The 7KQ3105 features an IP65 / NEMA 4X cast-aluminum flameproof (Ex d) enclosure with an integrated thermal management system, rated for ambient temperatures between -20°C and +55°C. It does not require a purged walk-in shelter or an instrument air purge cabinet, making it suitable for mounting directly on pipeline skids or marine deck machinery spaces.

What is the cycle time between analytical runs?

Depending on gas composition and configuration (Standard C6+ vs. Extended C9+), a complete chromatogram analysis, integration, and physical property calculation cycle takes between 120 and 180 seconds.

How does the SITRANS CV handle custody transfer and fiscal certification?

The device carries PTB, MID, and OIML R 140 Class A approvals. It runs embedded physical property calculations according to ISO 6976, GPA 2172, and AGA-8, automatically calculating calorific values, Wobbe Index, and relative density to metrological standards directly on board.

What is the power requirement for the analyzer?

The unit runs on a nominal 24 V DC power supply (operable across an 18 to 30 V DC range). During initial heat-up, peak inrush current is 5 A, which settles to a steady-state power consumption of 40 to 60 W depending on external ambient temperatures.

14 DAYS RETURN POLICY

RETURNS ARE ACCEPTED IN 14 DAYS. BUYER PAYS THE SHIPPING CHARGES. RESTOCKING FEES 20%.

NOTE:

IF THE ITEM COMES UNDER CUSTOMS, THE BUYER WILL BE FULLY RESPONSIBLE FOR DUTIES AND OTHER CHARGES. WE, AS THE SELLER, DO NOT ACCEPT RETURNS OR REFUNDS IN THIS CASE. KINDLY CONNECT WITH US BEFORE PURCHASING AN ITEM OR IF YOU HAVE ANY OTHER QUERIES.

FEEDBACK

WE WILL BE WAITING FOR YOUR VALUABLE FEEDBACKS. THANK YOU FOR SHOWING TRUST IN US.

100% Genuine Products

-> YOU WILL GET WHAT YOU SEE IN PHOTOS

-> UNDERSTAND THE PRODUCT BEFORE BUYING

PACKAGING

QUALITY PACKING FOR EACH PRODUCT. ASSURED SAFE & UNDAMAGED DELIVERY.

SHIPPING

FeDEX, DHL EXPRESS INTERNATIONAL SHIPPING.