Description
Product Overview
The EPRO MMS 3311 is a speed and key transmitter used in machinery monitoring systems where rotational speed and reference pulses are required for operating supervision or protection logic. It processes signals from compatible eddy-current sensors and provides speed-related outputs to connected control, monitoring, or protection equipment. In a turbine installation, for example, speed measurements can support operating-status monitoring, while key pulses provide a rotational reference for the wider monitoring system.
The transmitter uses two sensor-input channels and supports configurable measurement functions. Published specifications describe a frequency range of 0–20 kHz and a configurable speed range up to 65,535 rpm, subject to the input frequency and selected setup. Its standard analog outputs can be configured for 0/4–20 mA operation, with optional galvanically isolated outputs on certain hardware versions. Additional options include programmable function outputs and serial or fieldbus communication. These options must be confirmed on the actual unit rather than inferred from the base model name.
For replacement procurement, the main risk is configuration mismatch. Two MMS 3311 units can differ in their communication interfaces, output isolation, function-output hardware, display, and sensor-converter arrangement. Before installation, compare the complete ordering code, terminal assignments, sensor type, measuring range, output scaling, and configuration settings. The part number 9100-00034-01 should be checked against the original nameplate or order documentation because the available catalog identifies the base MMS 3311 order number as 9100-00034, without independently establishing the -01 suffix.
Product Introduction
The EPRO MMS 3311 provides rotational speed measurement and key-pulse generation for industrial machinery monitoring. Its configurable outputs allow measured values and operating states to be passed to compatible monitoring and control equipment. Sensor and transmitter supervision can also identify certain signal or internal faults and indicate the channel-clear state through configured outputs.
When replacing an existing transmitter, confirm the sensor model, measurement range, number of teeth or key marks, output scaling, and installed communication option. Where the unit is part of a machinery protection system, verify the replacement against the approved protection design and commissioning procedure; a matching model designation alone does not prove that its settings are equivalent.
Key Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | EPRO |
| Product model | MMS 3311 |
| Part number supplied | 9100-00034-01 |
| Base catalog order number | 9100-00034; exact suffix requires confirmation |
| Product type | Speed and key transmitter |
| Product family | MMS 3000 |
| Sensor inputs | Two independent channels |
| Compatible sensors | Compatible EPRO eddy-current sensors; exact model must be checked |
| Measurement frequency | 0–20 kHz |
| Configurable speed range | Up to 65,535 rpm, subject to input frequency and configuration |
| Analog current outputs | Configuration-dependent; 0/4–20 mA options |
| Maximum current-output load | 500 Ω, per published datasheet |
| Power supply | Two redundant 24 V DC inputs |
| Standard configuration interface | RS-232 |
| Optional communication | RS-485 with EPRO protocol V2.0 or PROFIBUS DP |
| Function outputs | Configuration-dependent; optocoupler, relay, or PhotoMOS options |
| Enclosure | Die-cast aluminum |
| Protection rating | IP65, per published datasheet |
| Operating temperature | −20 to +65°C under the specified mounting conditions; lower limit conditions apply when mounted on spacing bolts |
| Maximum weight | Approximately 1.3 kg net, depending on options |
| Configuration software | MMS 3910; associated configuration kit listed as MMS Para Kit |
| Installation | Direct machine mounting; follow the manufacturer’s orientation and wiring guidance |
| Product condition | Confirm actual condition with supplier |
Specifications are based on published MMS 3311 documentation. Actual values and available functions depend on the installed hardware options and the verified part-number suffix.
MMS3311 9100-00034-01
Related Products
These products belong to the same machinery-monitoring family or support related monitoring functions. They are comparison references, not confirmed drop-in replacements.
| Model | Function |
|---|---|
| MMS 3110 | Relative rotor vibration transmitter |
| MMS 3120 | Bearing vibration transmitter for electrodynamic sensors |
| MMS 3210 | Shaft position transmitter |
| MMS 3410 | Inductive sensor transmitter for shift monitoring |
| MMS 3910 | Configuration software for compatible MMS 3000 transmitters |
These model functions are documented in the MMS product catalog. Check the required measurement function and hardware configuration before selecting a related product.
Frequently Asked Questions
Q1: What is the EPRO MMS 3311 used for?
It measures rotational speed and generates key pulses for monitoring rotating machinery such as turbines, compressors, pumps, fans, and gearboxes.
Q2: How many sensor channels does it support?
The published MMS 3311 design has two independent sensor inputs. Both channels and their functions must be configured according to the application and installed hardware.
Q3: Does it provide a 4–20 mA output?
Yes, the product family supports configurable 0/4–20 mA outputs. Output isolation and channel assignment vary by configuration, so confirm the specific unit’s terminal layout and settings before connecting it to a control-system analog input.
Q4: Does the MMS 3311 support PROFIBUS DP?
PROFIBUS DP is listed as an optional communication interface. It is not safe to assume that every MMS 3311 includes this option; inspect the installed unit and its ordering code.
Q5: Can the transmitter be used with any speed sensor?
No. The manufacturer documents compatibility with specified EPRO eddy-current sensor types. Confirm the sensor model, electrical characteristics, measurement geometry, and any external converter requirements before commissioning.
Q6: What should be checked before ordering part number 9100-00034-01?
Verify the complete label, including the suffix, and compare the communication interface, analog-output configuration, function outputs, display option, and sensor-converter arrangement with the installed transmitter. Ask the supplier to document the unit’s condition and functional test results.
Q7: Is the MMS 3311 a direct replacement for another MMS 3000 transmitter?
Not necessarily. Other MMS 3000 models perform different measurement functions, such as shaft position or bearing vibration monitoring. Even another MMS 3311 may have different hardware options or settings. Confirm the exact configuration and approved replacement requirements before installation.
