EMERSON & EPRO Sensor

Overview

Brand Name:	Emerson Epro
Model Number:	MMS6312
Country of Origin:	USA
Packaging Details:	Original new Factory Sealed
Delivery Time:	in stock
Payment Terms:	T/T

Contact for quotation

Sales Manager:	Stella
Send an email:	[email protected]
Contact in Whatsapp:	+86 18159889985

Specifications

Parameter	Specification
Model	MMS6312
Manufacturer	epro GmbH
Product Family	MMS 6000 System
Number of Channels	2 independent differential inputs
Input Type	Pulse sensors (eddy-current PR 6422…PR 6425 with CON 0, or PR 9376 / PR 6453, or equivalent)
Input Resistance	>100 kΩ
Input Voltage Range	0 to ±27.3 V DC
Max. Permissible Input Voltage	0 to –30 V
Input Frequency Range	0 to 20,000 Hz
Max. Configurable Speed	65,535 RPM
Trigger Marks per Revolution	1 to 255 (configurable)
Sensor Supply Voltage (per channel)	±26.75 V DC nominal
Sensor Supply Current	20 mA nominal / 35 mA maximum
Analogue Outputs	2 × 0/4…20 mA (galvanically isolated, 500 Ω load max., 16-bit resolution, ±1% accuracy)
Pulse Outputs (TTL)	2 × standard + 2 × inverted (0…5 V, 0…20 kHz, load >10 kΩ)
Limit Outputs	4 alarm outputs (2 per channel), configurable as increasing/decreasing, latching/non-latching
Binary Control Inputs	Alarm reset, inhibit, optocoupler mode selection (24 V logic, >10 kΩ)
Communication Interfaces	RS 232 (front panel, for local configuration); RS 485 (for MMS 6850 integration, up to 31 modules / 62 channels per bus)
Power Supply	18…31.2 V DC (redundant inputs, diode-decoupled)
Power Consumption	Information not specified in the source material
Operating Temperature	0 to +65°C
Storage/Transport Temperature	–30 to +85°C
Relative Humidity	5 to 95% (non-condensing)
Vibration Resistance	0.15 mm amplitude (10–55 Hz); 16.6 m/s² (55–150 Hz)
Shock Resistance	98 m/s² peak, 16 ms duration
Protection Class	IP00 (module) / IP21 (front panel)
Order Number	9100-00025
Accessories	MMS 6910 W (operating manual, configuration software, connection cables)

Description

The MMS6312 is a dual-channel rotational speed monitor from epro‘s MMS 6000 series, engineered for precise speed measurement on steam, gas, and hydro turbines as well as compressors and fans. The MMS6312 accepts inputs from eddy-current pulse sensors (PR 6422…PR 6425 with CON 0, PR 9376, or PR 6453) and can be configured for independent channel operation or combined modes such as direction of rotation detection and differential speed monitoring. The MMS6312 provides two galvanically isolated 0/4…20 mA outputs, four configurable alarm limits, and RS 232/RS 485 communication interfaces for integration with epro‘s Analysis and Diagnostic System MMS 6850. The MMS6312 supports redundant power inputs and hot-swappable module replacement during operation.

Applications

Turbine Speed Monitoring – Measures rotational speed on steam, gas, and hydro turbines for control and protection systems
Compressor Protection – Monitors shaft speed on centrifugal and axial compressors to prevent overspeed and surge conditions
Fan and Blower Overspeed Protection – Detects overspeed events on induced draft fans, forced draft fans, and other air-moving equipment
Pump Speed Monitoring – Measures pump shaft speed for performance tracking and cavitation detection
Direction of Rotation Detection – Identifies reverse rotation on turbines, compressors, and other rotating machinery using two phase-shifted trigger marks
Differential Speed Monitoring – Compares speeds between two shafts (e.g., gearbox input/output) to detect gear tooth wear or coupling slippage
Keyphasor/Phase Reference – Provides key-pulse outputs with defined phase relation for balancing and vibration analysis
Redundant Speed Systems – Supports 1-out-of-2 voting configurations for critical overspeed protection applications
Standstill Detection – Detects zero-speed conditions on standstill trigger wheels for startup sequencing and anti-rotation monitoring

Features

Dual Independent Channels – Two channels can operate independently (speed, standstill, or key-pulse) or in combination (direction, differential speed) without compromising the other channel‘s function
Versatile Sensor Compatibility – Accepts inputs from epro eddy-current sensors (PR 6422…PR 6425 with CON 0), PR 9376, PR 6453, or any sensor system with matching specifications
Hot-Swappable Design – Module can be replaced during operation without powering down the system, minimizing downtime
Redundant Power Inputs – Two supply inputs (18…31.2 V DC) are decoupled via diodes; if one supply fails, the other automatically takes over without interruption
Comprehensive Self-Diagnostics – Continuously supervises input signals, sensor cabling (short circuit/break detection), supply voltages, configuration integrity, and watchdog timer
Configurable Measuring Modes – Supports speed measurement, standstill detection, key-pulse detection, direction of rotation, and differential speed monitoring—all field-configurable
Adjustable Trigger Levels – Manual or automatic trigger level adjustment for reliable signal acquisition across varying sensor outputs
Multiple Analog and Digital Outputs – Provides two isolated 0/4…20 mA outputs, standard and inverted TTL pulse outputs per channel, and four configurable alarm limit outputs
RS 232/RS 485 Communication – Local configuration via front-panel RS 232; RS 485 bus supports up to 31 modules (62 channels) for integration with MMS 6850 Analysis and Diagnostic System
High Accuracy – 16-bit resolution for analog outputs with ±1% full-scale accuracy
Wide Frequency Range – Handles input frequencies from 0 to 20 kHz, configurable to speeds up to 65,535 RPM
Limit Supervision Flexibility – Four alarm outputs can be configured as increasing/decreasing, latching/non-latching, and can be inhibited or reset via external binary inputs

Theory of Operation

The MMS6312 processes signals from pulse-type speed sensors (eddy-current or magnetic) that detect passing trigger marks on a rotating shaft. Each channel‘s input signal is conditioned, amplified, and compared against a configurable trigger threshold (manual or automatic). The module measures rotational speed using either a time-window method (counting pulses within a configurable 5–10 ms window, reaction time 26 ms) or a per-revolution method (measuring the time between consecutive pulses). For standstill detection, the module monitors the time interval between pulses across a configurable range (1–1700 seconds). The calculated speed is converted to a 0/4…20 mA analog output proportional to the selected measuring range and mode. A frequency-to-pulse converter provides TTL-compatible outputs for external counters or monitoring systems. The module continuously performs self-diagnostics: it verifies the input signal is within a preset window, checks for cable faults (short circuit or open circuit), monitors supply voltages, and runs a watchdog timer. Any detected fault triggers a “channel clear” LED to go off and sets a binary fault output. The four limit outputs can be configured individually to activate at high or low thresholds, with latching or non-latching behavior, and can be reset or inhibited via external control inputs. Communication with external systems occurs through the RS 485 bus for data exchange with MMS 6850, or via the front-panel RS 232 interface for local configuration using a laptop running epro‘s configuration software.

FAQ

Q1: What sensors are compatible with the MMS6312?

A1: The MMS6312 accepts input from epro eddy-current pulse sensors PR 6422…PR 6425 (with CON 0 connector), PR 9376, PR 6453, or any sensor system with matching electrical specifications. Sensor supply voltage (±26.75 V DC) is provided by the module.

Q2: Can the MMS6312 measure direction of rotation?

A2: Yes. When both channels are used in combination with two trigger marks (one phase-shifted), the MMS6312 detects the direction of rotation. This is useful for reverse rotation protection on turbines and compressors.

Q3: Can the module be replaced without shutting down the system?

A3: Yes. The MMS6312 is designed for hot-swappable replacement during operation. Its redundant power inputs ensure continuous operation, and the RS 485 bus allows reconfiguration without powering down the entire system.

Q4: How many trigger marks can be used with the MMS6312?

A4: The module supports 1 to 255 trigger marks per revolution. This flexibility allows it to be used with gear wheels, toothed discs, or shafts with multiple key marks, accommodating various mechanical configurations.

Q5: What happens if a sensor cable fails?

A5: The MMS6312 continuously supervises cabling and detects short circuits and cable breaks (for PR 9376 sensors). When a fault is detected, the affected channel‘s “channel clear” LED turns off, a binary fault output is set, and the reason for the fault can be read via the RS 232/RS 485 communication interface for rapid troubleshooting.

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