Pressure, level and flow instrumentation for Zone 0, Zone 1 and Zone 2 areas, with the certification documents the site and the insurer will ask for.
Hazardous-area instrumentation is a documentation exercise as much as a measurement one. The sensor, the barrier or isolator and the cable all have their own certification, and the installation is only compliant if the entity parameters match across the loop. A transmitter with the right accuracy and the wrong certificate cannot be installed at all.
Our oil and gas range covers Ex ia and Ex d pressure transmitters for wellhead, pipeline and process duty, radar level transmitters for tank farms and separators, and isolating signal conditioners that include the intrinsic safety barrier in the same DIN-rail module. Every certificate is supplied with the instrument, and the entity parameters are printed on the label as well as the datasheet.
For upstream and midstream applications we also supply high-pressure transmitters to 1,000 bar, corrosion-resistant wetted parts for sour service, and remote-seal diaphragm assemblies for viscous and high-temperature media where a direct mount would not survive.
Application Reality
These are the failure modes we are called in to solve, and the specification change that addresses each one.
A certified transmitter connected through an uncertified barrier is a non-compliant installation. We supply the barrier, the transmitter and the loop calculation as one package.
H₂S-bearing media attack standard 316L. Wetted parts in compliance with NACE MR0175 are specified for sour wells and wet gas pipelines.
Direct-mounted transmitters clog or overheat. Remote-seal diaphragm assemblies move the sensing element away from the process and allow flushing.
Custody transfer and inventory reconciliation need better than 3 mm. 80 GHz radar with a stilling well gives that, and it does not touch the product.
Commissioning teams need certificates, nameplate photographs and loop drawings at handover. We ship a documentation pack per instrument with the shipment.
Products
DM-SD24-LPI-2R
DM-SC04-ISO-4CH
DM-FV40-VX-025
DM-LR60-RD-30M
DM-TT200-HART
DM-PT2150-SS-400
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Standards
| Standard | Requirement |
|---|---|
| ATEX 2014/34/EU | Equipment certification for explosive atmospheres |
| IECEx | International hazardous-area certification |
| NACE MR0175 / ISO 15156 | Sour service material compliance |
| IEC 61508 SIL 2 | Functional safety capability |
Application Example
Situation
A producer was tripping the separator on high level two or three times a month because the existing guided-wave probe was blinded by wax and sand build-up.
What we changed
The contact probe was replaced with an 80 GHz radar transmitter on a 100 mm nozzle, configured with a build-up suppression algorithm and a narrow 4° beam that avoided the internal baffle.
Result
Level trips stopped over a nine-month observation period, and the same transmitter was specified for four additional separators at the site.
FAQ
Only if the barrier's entity parameters (Uo, Io, Po, Co, Lo) are compatible with the transmitter's input parameters (Ui, Ii, Pi, Ci, Li) and the cable capacitance and inductance stay within the allowed values. We will run the calculation for you if you provide the barrier model.
Yes. Ex ia is used where intrinsic safety suits the loop and the panel has barriers; Ex d flameproof is used for high-power or non-intrinsically-safe circuits. The two versions share the process connection envelope.
Standard transmitters reach 1,000 bar in 316L. Above that, we supply custom capsules to 1,500 bar for wellhead applications, with lead times of 6-8 weeks.
Wetted parts are available in NACE MR0175 compliant materials, typically 316L with a defined hardness limit or duplex 2205 for higher chloride levels. State the H₂S partial pressure and the chloride concentration when you enquire.
Each instrument ships with its certificate of conformity, the nameplate data, the entity parameter sheet or the Ex d schedule, and installation instructions. A loop drawing pack is available for projects that need it at handover.
Send the application details and get a specification back within one business day.