AMAC Group | Saudi Industrial Instrumentation
Industrial Pressure and Differential Pressure (DP) Transmitters
Pressure measurement spans gauge, absolute, differential and vacuum service, as well as DP-based flow, tank level and filter monitoring. AMAC can assist with technical sourcing, installation, instrument tubing/manifold scope and commissioning requirements for Saudi process plants, utilities and E&I packages.
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Choose the correct pressure measurement
| Transmitter type | Typical service | What to specify |
|---|---|---|
| Gauge pressure | Pumps, pipelines, hydraulic/process pressure | Pressure relative to ambient; range, overpressure, connection |
| Absolute pressure | Vacuum, atmospheric-independent process control | Sealed absolute reference, low pressure, required accuracy |
| Differential pressure (DP) | Orifice/Annubar flow, filters, pump differential, closed-tank level | DP span AND maximum static pressure, 3/5-valve manifold and impulse lines |
| Remote diaphragm seal pressure/DP | Hot, viscous, hygienic, corrosive media | Seal diaphragm, flange/capillary, fill fluid and temperature |
| Hydrostatic/submersible pressure | Open-tank/groundwater level | Fluid density, immersion, venting and cable length |
Common technical reference series
Emerson Rosemount 3051: pressure/DP family widely used in pressure, DP flow and hydrostatic level systems. Siemens SITRANS P320/P420: gauge, absolute and differential pressure family with configurable communication and accuracy variants. Endress+Hauser Cerabar PMP51B: process pressure family. Endress+Hauser Deltabar PMD75B: DP pressure family. Buyer-supplied exact part codes govern range, connections, materials, housing and hazardous-area certification.
DP flow and level applications
DP flow measurement requires an orifice plate, Venturi, flow nozzle, averaging Pitot or other engineered primary element plus impulse lines/manifold. The transmitter senses differential pressure; actual volume or mass flow needs appropriate square-root extraction and density/process compensation. To procure the whole measurement loop, include primary element, taps, design code, flow calculation, totalizer, impulse tubing, heat tracing and calibration.
For level, hydrostatic DP depends on fluid density, closed-vessel vapor-space pressure and wet/dry leg arrangement. Highly viscous media may require remote diaphragm seals.
Engineering checklist
- DP range and maximum line static pressure are different ratings: specify both clearly.
- Define calibration span including lower/upper range values and whether output is linear or square-root.
- Identify wetted material, NACE requirements, diaphragm seal, process fluid chemistry, temperature and pressure exposure.
- Supply connection NPT, process flange or instrument manifold/valve block, orientation and impulse line protection.
- Select HART, FOUNDATION Fieldbus or other supported protocol, loop power, local display and hazardous-area approvals.
- For existing transmitters, submit full Rosemount/Siemens/Endress+Hauser model code and mounting/remote seal details.
Project service and procurement packages
DP transmitter supply may be only one BOQ line in a broader EPC scope. AMAC can review pressure instruments with instrument tubing, fittings, manifolds, cable/gland, termination, installation, loop checking, instrument calibration and DCS integration as separate technical/commercial line items. Explore full E&I packages.
Information required for a reliable technical quotation
- Gauge/absolute/DP, range and maximum static pressure, overpressure and accuracy
- Fluid/gas, corrosion, operating and design temperatures
- Process connection, flange, remote diaphragm seal/manifold and materials
- Electrical supply, HART/fieldbus, indicator and Ex certificate
- Full OEM model string, tag numbers, quantity and technical datasheet
- DP flow primary element, impulse tubing and installation scope if included
Contact AMAC Saudi Arabia
For an instrument replacement, send the manufacturer name, complete original model and serial number, existing range, process connections and datasheet. For EPC and E&I packages, attach the BOQ, instrument index, P&ID, technical datasheets and approved vendor requirements.
sales@amac-group.com · +966 53 217 2711 · Contact form
Brand/model examples are identification references only, not claims of OEM agency, stock, fixed price, performance guarantee or Saudi end-user approval. Final acceptance depends on selected variant, application and current OEM documents.
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