Oil & Gas
CRS PLUS sources field instrumentation for oil and gas, utility and process plants — pressure, temperature, flow and level measurement, gas and flame detection, and the fittings, manifolds and tubing that connect them — against the project instrument datasheet. Each instrument is supplied with its calibration certificate and, where required, hazardous-area and SIL certification.
Sourced through the qualified supplier base. Listing does not indicate stock held by CRS PLUS — availability, origin and lead time are confirmed per enquiry, and every quotation states the certification that governs the supply.
Specified by range, accuracy class, process connection and wetted material.
Thermowell material and insertion length follow the line specification and wake-frequency calculation.
Meter type follows fluid, accuracy requirement and custody-transfer status.
Selected on fluid, vessel geometry and process conditions.
Certified for the hazardous-area zone in which they are installed.
The impulse-line bill of materials for each instrument installation.
An instrument enquiry is defined by the datasheet parameters below. Supplying the datasheet, or a tag list with these fields, allows an exact quotation.
| Parameter | What it defines | Common values |
|---|---|---|
| Measured variable and range | What is measured and over what span | e.g. 0–100 bar g; −50 to +400 °C; 0–500 m³/h |
| Accuracy class | Permitted error | Gauges class 1.0 or 1.6 to EN 837; transmitters ±0.075 % of span typical |
| Process connection | How the instrument mounts | ½" NPT; flanged ASME B16.5 class 150/300; thermowell thread or flange |
| Wetted materials | Parts in contact with the process | 316L stainless; Hastelloy C-276; Monel; PTFE-lined |
| Output and protocol | Signal to the control system | 4–20 mA with HART; Foundation Fieldbus; Profibus PA; switch contacts |
| Power supply | Loop or external | Loop-powered 24 V DC two-wire; four-wire |
| Ingress and hazardous-area rating | Enclosure and Ex certification | IP66/67; Ex ia or Ex d, ATEX and/or IECEx |
| Functional safety | SIL capability where used in a safety function | SIL 2 or SIL 3 per IEC 61508 |
| Calibration | Traceable calibration at supply | Certificate traceable to national standards |
The most common temperature-measurement question on an enquiry.
| Property | Thermocouple | RTD (Pt100) |
|---|---|---|
| Principle | Voltage from two dissimilar metals | Resistance change of platinum |
| Range | Wide: −200 to +1700 °C depending on type | −200 to +600 °C |
| Accuracy | Moderate: ±1.5 to ±2.5 °C class 1 | High: ±0.15 °C at 0 °C class A |
| Response | Fast | Slower |
| Stability and drift | Drifts with age and contamination | Very stable |
| Cost | Lower | Higher |
| Typical use | Furnaces, heaters, high temperature | Process temperatures below 600 °C where accuracy matters |
No manufacturer-specific figures are published here: CRS PLUS sources from several mills and manufacturers and each issues its own certificate, which governs. These are the documents an instrumentation delivery will normally include.
| Document or test | Standard or method |
|---|---|
| Calibration certificate | Multi-point, traceable to national standards, per instrument |
| Material certificate for wetted parts | EN 10204 3.1 for pressure-retaining parts |
| Hydrostatic test | For thermowells, manifolds and pressure-retaining housings |
| Hazardous-area certificate | ATEX EU-type examination and/or IECEx certificate of conformity |
| Functional safety certificate | IEC 61508 SIL certificate and FMEDA data where specified |
| Thermowell wake-frequency calculation | ASME PTC 19.3 TW where specified |
| Flow meter calibration | Wet calibration on accredited rig for custody or fiscal meters |
| Gas detector bump-test and calibration | With certified calibration gas |
| Declaration of conformity | CE / PED where applicable |
| Instrument datasheet and manual | Per ISA or project format |
A gauge gives a local reading only. A transmitter converts the measurement to a 4–20 mA or digital signal for the control system, supports alarms and trending, and is required wherever the value is used in control or safety logic. Many installations fit both: a transmitter for the control room and a gauge for local indication during operation and maintenance.
HART is a digital communication protocol superimposed on the 4–20 mA analogue signal. It allows the control system or a handheld communicator to read diagnostics, configure range and tags, and retrieve secondary variables from the instrument without disturbing the analogue loop. Most modern transmitters are supplied with HART as standard.
Safety Integrity Level, from IEC 61508 and 61511, expresses the risk reduction a safety instrumented function must achieve. An instrument used in a SIL 2 loop must have a certified failure-rate analysis and diagnostics that allow the loop to meet a probability of failure on demand between 10⁻³ and 10⁻². The instrument’s SIL certificate states its suitability; the loop design determines whether SIL 2 is achieved.
Flowing fluid sheds vortices from the thermowell that can excite it at its natural frequency and cause fatigue failure. ASME PTC 19.3 TW sets the method for checking that the thermowell’s natural frequency is safely above the vortex-shedding frequency for the line conditions. The calculation needs the well dimensions, material, insertion length, fluid properties and velocity, and is normally supplied with the thermowell.
Orifice plates with DP transmitters remain the most common for gas and steam where moderate accuracy is acceptable. Coriolis meters give the highest accuracy and measure mass directly, and are specified for custody transfer and chemical injection. Electromagnetic meters suit conductive liquids such as water. Ultrasonic meters suit large-diameter gas and liquid lines without pressure loss. Turbine and positive-displacement meters are used for clean liquids and fiscal metering of products.
The instrument datasheet, or for each tag: the measured variable and range, process fluid and conditions, process connection, wetted materials, output signal and protocol, power supply, enclosure and hazardous-area rating, any SIL requirement, and quantity. Accessories — manifolds, brackets, cable glands — should be listed if required.
CRS PLUS sources instrumentation from its qualified supplier base of certified manufacturers in Europe, Asia and the Gulf. Origin and certification are stated on each quotation. Where an operator’s approved-vendor list restricts the make, CRS PLUS sources against that list. CRS PLUS does not name manufacturers on this page and holds no distribution or agency agreement with any of them.
A structured offer follows within 72 hours.