EPRO MMS3210-020-020

Product Series: EPRO MMS3000 Transmitter Series (MMS3210 sub-family)

Product Brief: Stand-alone or rack-mountable transmitter that accepts two eddy-current probe inputs (PR 6422/23/24/25/26 series with appropriate preamplifier) and converts shaft relative vibration/displacement signals into two independent proportional 0/4–20 mA analog outputs. Can be configured for single max-value output or dual independent outputs. Includes built-in self-test and “OK” status contact. Conforms to API 670.

Category: Emerson

Description

Working Principle: Conditions the AC + DC component from eddy-current probes; separates dynamic vibration (AC) and static position (DC) if required by configuration; scales to user-defined measurement range; drives isolated 4–20 mA loops. Continuously monitors sensor integrity; on fault drives “OK” relay and forces 0 mA (or preset) on analog outputs.

Sensor Input: 2 × independent eddy-current probe channels (compatible with EPRO PR 642x probes + PR 935x or built-in preamp depending on cable length)

Outputs:

2 × 0/4–20 mA DC, isolated, proportional to shaft vibration amplitude or position (selectable)
Optional: one output proportional to max(S1, S2) of the two channels
1 × logic “OK” (Channel Healthy) — solid-state or relay contact, changes state on sensor/module fault; 4–20 mA then goes to 0 mA or < 3.6 mA (NAMUR NE43)

Alarm Contacts: Typically 2–5 configurable solid-state/relay outputs depending on exact variant (Alert / Danger per channel or combined)

Supply Voltage: +24 V DC (typical range 18–32 V DC), dual redundant supply inputs on some versions

Accuracy: ±1 % FS

Frequency Response (Dynamic): Configurable bandpass; typically 0.5 Hz – 10 kHz for vibration measurement

Protection Class: IP65 (when housed in local enclosure / field mount version); IP20 (if rack-mounted)

Configuration: Via DIP switches/trim pots on PCB or via MMS 3910W Windows configuration software over RS-232/485

Operating Temperature: –20 °C to +70 °C (electronics); process (probe) temperature per probe spec

Mounting: DIN rail (field version in IP65 housing) or slot in MMS3000 local rack

Compliance: API 670, VDI 2059, CE, EMC directives

Applicable Industries: Power plants (steam/gas turbine bearing vibration), oil & gas compressors, large fans/blowers, centrifugal pumps, cement kiln drives, marine propulsion turbines

Installation Requirements: Mount in vibration-isolated location or IP65 field housing near machine; use shielded twisted-pair for 4–20 mA loops, ground shield at one end (typically DCS/supply end); ensure probe linearization range is set to match actual probe gap.

Usage Notes: After installation verify “OK” LED is lit green; if extinguished check probe continuity and gap voltage; on sensor failure the 4–20 mA output drops below 3.6 mA to signal fault per NAMUR — receiving system must be configured to recognize this as sensor error, not zero reading.

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