Out of stockEmerson / RosemountLevel Sensors & Transmitters
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1 / 8Rosemount 3051S ERS (Electronic Remote Sensor) — a 2-wire 4-20 mA HART DP-level system that calculates differential pressure electronically from two linked pressure sensors instead of oil-filled capillaries. This unit is a 300ERS primary housing on a flanged remote seal (JIS 100A / 4-inch). In Barmaan stock.
The Rosemount 3051S ERS System (Electronic Remote Sensor) is Emerson's digital DP-level architecture. Instead of two oil-filled capillaries feeding one differential-pressure cell, it uses two independent 3051S pressure sensor modules — an ERS Primary (which holds the 4-20 mA HART loop termination and the optional LCD display) and an ERS Secondary — joined by an ordinary electrical cable. Each module measures its local pressure and the electronics compute the differential digitally. On tall vessels and distillation columns this removes the temperature-induced errors and the response lag of long capillary fills, delivering more accurate and repeatable DP-level readings, faster response, simpler installation and lower maintenance.
Built on the 3051S SuperModule platform, the seal/level ERS transmitter (3051SAL) offers reference accuracy of 0.055% of span (Ultra) or 0.065% (Classic) with 150:1 rangedown, and the family provides 15-year long-term stability (±0.15% of URL for 15 years) and IEC 61508 SIL 2/SIL 3 capability. The ERS System runs on 16.0 to 42.4 V DC, tolerates ambient temperatures from -40 to 85°C, offers static pressure ratings to 10,000 psi, and its enclosure meets NEMA 4X, IP66 and IP68. Isolating (seal) diaphragms are available in 316L SST, Alloy C-276, Alloy 400 and Tantalum with a range of fill fluids.
The specific unit in Barmaan stock is a 300ERS primary electronics housing (housing model 300ERSP1KAC1J1M5T1, HART 4-20 mA, Plantweb LCD display, transient protection) mounted on a flanged remote diaphragm seal on a JIS 100A 4-inch flange, marked Ex ia IIC T4 Ga per ATEX certificate BAS01ATEX1303X, IP66/68, made in Singapore, manufacturing date 02/24 — process tag L66. It is a used industrial instrument, physically available in our warehouse; all nameplate photos are of this exact unit.
| Attribute | Value |
|---|---|
| General | |
| System / architecture | Rosemount 3051S ERS — 2-wire 4-20 mA HART; DP computed electronically from two linked 3051S sensors |
| Measurement type | Differential pressure level (also DP / flow / pressure) |
| This unit | 300ERS primary housing 300ERSP1KAC1J1M5T1, HART, LCD display; Ex ia IIC T4 Ga (BAS01ATEX1303X); JIS 100A 4-inch flanged seal; tag L66; mfg 02/24 |
| Performance & accuracy | |
| Reference accuracy (SAL seal/level) | 0.055% of span (Ultra) / 0.065% of span (Classic) |
| Rangedown | 150:1 (SAL); up to 200:1 (SAM Ultra) |
| Long-term stability | ±0.15% of URL for 15 years |
| Process conditions & connection | |
| Maximum static pressure | Up to 10,000 psi (689.47 bar) — range code 5A |
| Ambient temperature | -40 to 85°C (-40 to 80°C with LCD display) |
| Construction & materials | |
| Isolating diaphragm materials | 316L SST, Alloy C-276, Alloy 400, Tantalum, gold-plated options |
| Seal fill fluids | Silicone 200, Neobee M-20, propylene glycol/water, UltraTherm 805, Tri-Therm |
| Ingress protection | NEMA 4X, IP66, IP68 [66 ft (20 m) for 168 h] |
| Power & output | |
| Output / protocol | 4–20 mA with HART (ERS architecture) |
| Supply voltage | 16.0 to 42.4 V DC (no load) |
| Approvals & safety | |
| Functional safety | IEC 61508 certified — SIL 3 capable (SIL 2 single / SIL 3 redundant) |
ERS = Electronic Remote Sensor. It measures differential pressure (for level) using two 3051S pressure sensor modules connected by an electrical cable — the electronics compute DP digitally instead of using two oil-filled capillary lines feeding a single DP cell.
On tall vessels long capillaries add temperature errors and slow the response. ERS eliminates the fill-fluid capillary between the taps, so per Emerson it gives more accurate, more repeatable DP-level, faster response, simpler installation and less maintenance.
The seal/level ERS transmitter (3051SAL) provides reference accuracy of 0.055% of span (Ultra) or 0.065% (Classic) with 150:1 rangedown, and 15-year long-term stability of ±0.15% of URL (per Emerson PDS 00813-0100-4801).
4-20 mA with HART protocol. The primary housing carries the loop termination and an LCD display. The nameplate confirms HART 4-20 mA, supply for the ERS system 16.0–42.4 V DC.
Yes — this unit is marked Ex ia IIC T4 Ga (intrinsically safe) per ATEX certificate BAS01ATEX1303X, with IP66/68 protection. The 3051S family is also IEC 61508 SIL 2/SIL 3 capable.
A complete ERS DP-level loop uses an ERS Primary plus an ERS Secondary joined by cable. This listing is the Primary (300ERS) housing on a flanged seal. Contact Barmaan to confirm the exact configuration and whether a matching secondary/cable is required for your loop.
Used / surplus, with a recent 02/24 manufacturing date. It is a genuine Rosemount 300ERS unit physically in Barmaan's warehouse; all nameplate photos are of this exact unit (process tag L66).
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