The 3100D-2-FM-1-1-LCD is a Mercoid Series 3100D explosion-proof smart differential pressure transmitter calibrated for a 0-30 inch WC (0-7.5 kPa) range with a 100:1 turndown rangeability for field re-ranging. The transmitter outputs a 4-20 mA loop signal with superimposed HART digital communication, powered from the loop on 11.9-45 VDC. A microprocessor-based capacitance sensor with automatic temperature compensation delivers +/-0.075% of full-scale accuracy at 20 deg C, with +/-0.125% FSO per year long-term stability. The unit features an integrated 5-digit LCD displaying primary process value, percent of span, milliamp output, or rotating modes, and includes push-button Zero/Span configuration under the nameplate for field commissioning without a HART communicator. EEPROM retains all configuration data through power loss or shutdown. Wetted parts are 316L stainless steel with fluoroelastomer seals, and the dual-compartment die-cast aluminum housing is rated NEMA 4X / IP66 with FM approval for Class I Division 1 Groups A, B, C, and D hazardous locations.
Explosion-proof differential pressure measurement in hazardous (classified) areas where the working dP falls in the 0-30 inch WC band: HVAC duct and building pressurization, filter dP, room pressure control, and similar low-pressure applications. The HART smart platform suits plants standardizing on digital asset management and remote configuration.
Key Features
FM approved for Class I Division 1 Groups A, B, C, and D. Dust-Ignition-Proof for Class II/III Division 1 Groups E, F, G. NEMA 4X / IP66 enclosure for outdoor and washdown environments.
4-20 mA analog output with superimposed HART digital signal. Configure ranges, units, damping, tag, and diagnostics from any HART communicator or asset management software.
+/-0.075% of full-scale accuracy at 20 deg C. +/-0.125% FSO/yr long-term stability. Thermal effect +/-0.125% span per 32 deg C.
Calibrated span field-adjustable from 0.6 to 30 inch WC (0.15 to 7.5 kPa). Re-range without changing hardware - one SKU covers many applications.
Local Zero and Span buttons under the nameplate let technicians trim and re-range the transmitter in the field without a HART communicator. EEPROM retains settings through power loss.
Self-diagnostic drives the output to <=3.75 mA (fail-low) or >=21.75 mA (fail-high) on sensor or microprocessor failure. Jumper-selectable on the CPU or LCD module.
316L stainless steel diaphragm and process connections with fluoroelastomer seals. Compatible with gases, steam, liquids, and vapors that don't corrode 316L SS.
Field-terminal compartment isolated from electronics. Two 1/2 inch FNPT conduit ports with internal and external ground terminals. Housing rotatable 90 degrees for cover orientation.
Display primary process value, percent of span, milliamp output, or rotate through all modes. Engineering-unit display supports volumetric flow, mass flow, or volume when configured.
Technical Specifications
| Specification | Value |
|---|---|
| Series | 3100D (Mercoid Smart Pressure Transmitter) |
| Service | Compatible gases, steam, liquids, or vapors |
| Pressure Range (Factory Cal) | 0-30 inch WC (0-7.5 kPa) |
| Lower Range Limit | -30 inch WC (-7.5 kPa) |
| Upper Range Limit | 30 inch WC (7.5 kPa) |
| Calibrated Span (Min-Max) | 0.6 to 30 inch WC (0.15 to 7.5 kPa) |
| Rangeability (Turndown) | 100:1 |
| Accuracy | +/-0.075% FS at 20 deg C |
| Stability | +/-0.125% FSO per year |
| Thermal Effect | +/-0.125% span per 32 deg C |
| Output Signal | 4-20 mA with HART communication |
| Power Supply | 11.9-45 VDC (loop-powered) |
| Loop Resistance | 0-1500 Ohm operating; 250-500 Ohm for HART |
| Response Time | 0.12 seconds |
| Damping Time | 0.25 to 60 seconds (adjustable) |
| Display | 5-digit LCD |
| Process Connection | 1/4 inch FNPT (high + low side) |
| Electrical Connection | 2x 1/2 inch FNPT conduit, screw terminals |
| Wetted Materials | 316L Stainless Steel + Fluoroelastomer |
| Housing Material | Die-Cast Aluminum |
| Enclosure Rating | NEMA 4X (IP66) |
| Hazardous Location | Class I Div 1 Groups A, B, C, D (Explosion-Proof); Class II/III Div 1 Groups E, F, G (Dust-Ignition-Proof); Class I Div 2 ABCD (Non-Incendive) |
| Process Temperature | -40 to 248 deg F (-40 to 120 deg C) |
| Ambient Temperature | -22 to 176 deg F (-30 to 80 deg C) with LCD; -40 to 185 deg F (-40 to 85 deg C) without LCD |
| Burst Pressure | 10,000 psi |
| Max Working Pressure | -14.5 to 2000 psi |
| Compliance | FM, CE, HART Communication Foundation |
| Weight | 8.6 lb (3.9 kg) |
| Manufacturer Part Number | 3100D-2-FM-1-1-LCD |
Documentation
Frequently Asked Questions
Yes. The 3100D-2-FM-1-1-LCD is FM approved as Explosion-Proof for Class I Division 1 Groups A, B, C, and D, Dust-Ignition-Proof for Class II/III Division 1 Groups E, F, and G, and Non-Incendive for Class I Division 2 Groups A, B, C, and D. The enclosure is also rated NEMA 4X / IP66 for indoor and outdoor wet locations.
The factory calibration is 0-30 inch WC. The 3100D supports a 100:1 turndown, so the calibrated span can be set anywhere within 0.6 to 30 inch WC (0.15 to 7.5 kPa) using either the local Zero/Span push-buttons under the nameplate or a HART communicator.
No. The transmitter ships factory-calibrated to its labeled range, and local Zero/Span push-buttons allow zero trim, span change, unit change, damping, and display configuration without any external communicator. A HART communicator is required only for advanced functions like custom engineering units, multi-drop addressing, or full asset management.
The 3100D is a 2-wire loop-powered transmitter requiring 11.9-45 VDC at the terminals. For HART communication, supply voltage must be at least 17.4 VDC and loop resistance between 250 and 500 Ohm.
The -LCD variants include a 5-digit LCD that can display primary process value, percent of span, milliamp output, rotating modes, or engineering units. Without the LCD, the transmitter is unchanged functionally. LCD versions have a narrower ambient range of -22 to 176 deg F vs -40 to 185 deg F for non-LCD versions.
Yes. The HART rangeability and unit conversion lets the transmitter output level in feet of water, inches WC, or engineering units when configured for level service.
Yes. Dwyer / Omega offers the BBV-1F (3-valve flanged) and BBV-22F (5-valve flanged) block manifolds as accessories. The flanged process connection on the diaphragm head mates directly to either manifold.
Any gas, steam, liquid, or vapor that is compatible with 316L stainless steel and fluoroelastomer (Viton-type) seals. For aggressive media incompatible with 316L SS, the 3100 family supports diaphragm seal options - consult factory for those configurations.
The 3100D continuously self-diagnoses. On detected failure, the output drives to a saturated value: <=3.75 mA (fail-low) or >=21.75 mA (fail-high), selectable by jumper. Standard alarm/saturation values: low/down = 3.9 mA, high/up = 20.8 mA.
- Brand:
- Dwyer / Omega
- Series:
- 3100D
- Pressure Range Category:
- Low (0-30 inch WC)
- Output Signal:
- 4-20 mA + HART
- Hazardous Location:
- FM Class I Div 1 (Explosion-Proof)
- Display:
- 5-Digit LCD
- Enclosure:
- NEMA 4X / IP66 Explosion-Proof
- Bypass Manifold:
- None (sold separately)
- Cable Type:
- Conduit Connection
- Power Supply:
- 11.9-45 VDC (Loop-Powered)
- Wetted Material:
- 316L Stainless Steel
- Country of Origin:
- Made in USA
