SOR 1800DP Differential Pressure Transmitter

A conventional DP transmitter for flow, level and filter monitoring

The SOR 1800DP is the differential pressure version of the SOR 1800 Series conventional transmitters. SOR describes the series as a rugged solution for pressure, level and flow applications and as a drop-in replacement for legacy transmitters. The 1800DP has a double-flange body with 1/4 in NPT(F) process connections and drain valves, an aluminium explosion-proof housing and a 4-20 mA output with optional HART 5, 1-5 VDC low power or Modbus.

Typical duties are the differential across an orifice plate or venturi for flow, hydrostatic level in a closed vessel using both ports, and pressure drop across filters or strainers.

Technical specifications

Reading the model code

SOR uses a quick-select tree: model (1800DP), range code (006, 040, 250, 01K, 03K, 10K), diaphragm material (S stainless steel or H Hastelloy), fill fluid (S silicone or F fluorocarbon), conduit connection (W1, F1 or F2 adapter), output (C 4-20 mA, V 1-5 VDC, Z 4-20 mA with HART 5, M Modbus, D Modbus with 4-20 mA), display (00 or IN LCD), process connection (C1E, C1U, C1L) and accessories. The catalog example is 1800DP-250-S-S-F1-Z-IN-C1E-CS.

Selecting range and options

Choose the range so that the lower and upper measuring points both sit within the range limits and the span is not below the smallest possible span. Accuracy degrades with turndown above 10:1, so pick the tightest range that still covers the maximum differential. Note the temperature limits: the flameproof approval limits the maximum process temperature to 176 F, while the intrinsically safe version limits it to 248 F. Wetted parts can be ordered with NACE MR0175/ISO 15156 compliance, degreasing or electropolishing as listed accessories.

Confirm before ordering: differential range and static pressure, diaphragm and fill fluid for the process, output and protocol, display, conduit adapter, hazardous-area approval, and mounting bracket. Remote and direct-mount diaphragm seal versions (1800RM, 1800DM) are separate models in the same catalog.

How the SOR 1800DP works

The two process ports apply the high and low side pressures to the sensor. The sensor responds to the difference between them, and the electronics turn it into a 4-20 mA output. The double-flange body lets both sides connect through 1/4 in NPT process connections with drain valves.

Where the 1800DP is used

• Flow across an orifice plate
• Flow across a venturi
• Hydrostatic level in closed vessels
• Pressure drop across filters
• Pressure drop across strainers

Selection checklist for the 1800DP

• Differential pressure range
• Static pressure
• Output type
• Diaphragm material
• Fill fluid
• Process temperature
• Supply voltage
• Process connection layout

Installation, commissioning and maintenance notes for the 1800DP

Mount the transmitter so the impulse lines are short and free of trapped gas or liquid. Open the drain valves to vent the body if needed. Check the zero with both sides at the same pressure and set the range before service.

Requesting a quotation for the SOR 1800DP

Please send the differential range, the static pressure, the fluid and the output needed. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

1800DP series

It belongs to the SOR 1800 Series of conventional transmitters.

1800DP transmitter type

It is the differential pressure version of the series.

1800DP duties

SOR describes the series as a rugged solution for pressure, level and flow.

1800DP body

It has a double-flange body.

1800DP process connections

The connections are 1/4 in NPT(F) with drain valves.

1800DP housing

The housing is aluminium and explosion-proof.

1800DP output

The standard output is 4-20 mA, linear by default or square root.

1800DP output options

Options are HART 5, 1-5 VDC low power and Modbus.

1800DP response time

The response time is 200 ms maximum.

1800DP damping

Damping is configurable from 0 to 100 s.

1800DP supply voltage

The 4-20 mA supply is 10.5 to 55 VDC.

1800DP HART supply

With HART and a 250 ohm load the supply is 16.5 to 55 VDC.

1800DP low power supply

The 1-5 VDC low power version uses 9 to 32 VDC.

1800DP Modbus supply

The Modbus version uses 5 to 32 VDC.

1800DP power consumption

The power consumption is 500 mW maximum at 24 VDC.

1800DP range 006

Range 006 is minus 0.87 to 0.87 psid with a minimum span of 0.03 psid.

1800DP range 040

Range 040 is minus 5.8 to 5.8 psid with a minimum span of 0.06 psid.

1800DP range 250

Range 250 is minus 36.3 to 36.3 psid with a minimum span of 0.36 psid.

1800DP range 01K

Range 01K is minus 72.5 to 145 psid with a minimum span of 1.45 psid.

1800DP range 03K

Range 03K is minus 72.5 to 435 psid with a minimum span of 4.35 psid.

1800DP range 10K

Range 10K is minus 72.5 to 1,450 psid with a minimum span of 14.5 psid.

1800DP over pressure

The over pressure limit is 2,321 psid on each side.

1800DP diaphragm and fill

The diaphragm is stainless steel or Hastelloy, and the fill is silicone oil or fluorocarbon oil.

1800DP process temperature

Silicone oil works from minus 40 to 248 degrees F, and fluorocarbon oil from minus 40 to 185 degrees F.

Transmitter records for the 1800DP

Record the range, the calibration date and the installed location.

Choosing the right 1800DP range

Choose the range from the expected differential and the static pressure of the line.

Documents and quotation

The attached documents are the SOR 1800 Series pressure transmitter catalog (Form 1906, includes the 1800DP specification, ordering tree, ranges and dimensions) and the 1800 Series product bulletin (Form 1891). Send the full model code or the process data for a quotation. See other pressure instrumentation products.