Sensors & Transmitters

Sensors & Transmitters is our category for field instruments that measure level, pressure and temperature and send the value to a control system. It holds transmitters, switches, gauges, probes and related accessories from Endress+Hauser, ABB, Rosemount, WIKA and VEGA, with other makers alongside. Seven Star LLC supplies these measurement instruments from Muscat to engineers and buyers in Oman and the GCC.

Pressure Instrumentation

Level Instrumentation

Category guide

About Sensors & Transmitters

239 products 52 brands 3 sub-categories

Level, pressure and temperature instrumentation

Level Instrumentation covers continuous level transmitters and point level switches: guided wave radar and non-contacting radar from Endress+Hauser, VEGA, Rosemount and Magnetrol, displacer transmitters and controllers from Masoneilan, vibrating fork switches, magnetic level gauges and ultrasonic transmitters.

Pressure Instrumentation covers gauge, absolute and differential pressure transmitters from Rosemount, Yokogawa, Endress+Hauser and Honeywell, pressure gauges and differential gauges from WIKA and others, pressure switches and compact transducers.

Temperature Instrumentation covers RTD probes and thermometer assemblies from JUMO, WIKA and ABB, head-mount and field-mount temperature transmitters from Rosemount and Siemens, safety temperature limiters and calibration equipment.

Points that apply to every sensor and transmitter

Whatever the measured variable, the same questions come up. The wetted materials must resist the process fluid, and for sour service the material requirements of NACE MR0175 / ISO 15156 normally apply. The output must suit the control system: 4-20 mA with HART is the common choice, with FOUNDATION Fieldbus, PROFIBUS PA or wireless as alternatives. In classified areas the instrument needs intrinsically safe or flameproof protection with ATEX or IECEx certification. Loops that are part of a safety instrumented function need a device with a SIL capability statement under IEC 61508.

What to send for a quotation

The most direct route is the complete model code from the nameplate or datasheet. Without it, send the process fluid, operating and design pressure and temperature, measuring range, process connection, output signal, area classification and required certificates. We check the code against the manufacturer documentation and propose the manufacturer’s successor when a model is obsolete.

What to include in your inquiry

These details let us quote the right item the first time.

Measured variable and range
Medium, pressure and temperature
Process connection and material
Output signal or protocol
Model code or nameplate photo of the existing device
Hazardous-area approval, if required

Missing some of them? Send what you have. A nameplate photo or an old part number is enough to start.

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Request a Quote for Sensors & Transmitters

Looking for a specific model, part number or brand in Sensors & Transmitters? Send us your requirements and quantities. Seven Star LLC sources genuine industrial equipment for customers across Oman and the GCC and replies with a formal quotation.

Free, no-obligation quotation · takes about 1 minute

Other enquiries: [email protected] · WhatsApp

Frequently Asked Questions

Can I replace a transmitter from one manufacturer with another brand?

Functionally yes, if the range, accuracy class, output signal, power supply and hazardous-area approval match. Mechanically, check the process connection, the manifold or flange pattern, the mounting bracket and the conduit entry thread. In a safety loop the replacement must also satisfy the SIL requirement of that loop. Send the existing model code and we list the points that differ.

What is the difference between intrinsically safe and flameproof instruments?

An intrinsically safe (Ex i) instrument limits the electrical energy in the circuit so that no spark or hot surface can ignite the atmosphere, and it must be connected through a suitable barrier or isolator. A flameproof (Ex d) instrument has an enclosure that contains an internal ignition. Intrinsic safety allows live work on the loop, while flameproof housings must stay closed when energized.

When do I need a SIL-rated transmitter?

When the transmitter is part of a safety instrumented function identified in the plant's risk assessment, with a required safety integrity level. The device then needs a certificate or assessment report to IEC 61508 showing its SIL capability and failure rate data, which the loop designer uses in the verification calculation. For ordinary control and monitoring loops this is not required.

Which certificates can be supplied with field instruments?

Manufacturers commonly issue a factory calibration certificate, a declaration of conformity, the ATEX or IECEx certificate for Ex versions and, on request, EN 10204 3.1 material certificates for wetted parts, NACE conformity statements and SIL documents. These options are often part of the model code and must be ordered with the instrument, so list them in your inquiry. We provide the documents the manufacturer issues.

A model in our plant standard is obsolete. What do you offer?

We look up the old model code in the manufacturer documentation and propose the successor the manufacturer names for it, translated option by option: range, materials, process connection, output and approvals. Where an option no longer exists, we say so and show the nearest equivalent. You receive the datasheet of the proposed model to compare against your plant standard.

What information do you need for a transmitter or sensor quotation?

Preferably the full model code. Otherwise: measured variable and range, process fluid, operating and maximum pressure and temperature, wetted material, process connection size and rating, output signal and protocol, electrical connection, area classification and the certificates required. For level instruments add tank height and nozzle details, and for temperature sensors the insertion length and thermowell data.

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