12-32 Vac or 10-48 Vdc power input board(left)
85-264 Vac or 90-300 Vdc power input (right)

Key Features

• Lightweight, high-frequency switching power supply design.
• 85-264 Vac or 90-300 Vdc power version
• 12-32 Vac or 10-48 Vdc power version
• Isolated 5, 10 or 24 Vdc transducer excitation output
• UL Recognized on-board fuse
• Three selectable isolated excitation outputs
• Certified to EN 61010-1 (CE mark) and RoHS
• ETL certified to UL 61010-1 and CSA C22.2#61010-1

Description

• High voltage AC or DC power. The standard Micron supply accepts power from 85-264 Vac, 47-63 Hz. This allows the same meter to operate worldwide without modification. The supply also accepts 90 to 300 Vdc (high voltage DC operation not ETL approved).
• Low voltage AC or DC power. An optional low voltage supply operates from 10 to 48 Vdc or 12 to 30 Vac, 47-63 Hz. This supply allows the Micron to be powered from batteries or from 28 Vac, 400 Hz aircraft power (400 Hz operation not ETL approved).

Isolated Excitation Output

Each power supply provides three jumper-selectable, isolated excitation outputs: 5 Vdc at 100 mA, 10 Vdc at 120 mA, or 24 Vdc at 50 mA. These outputs can be used to power external sensors, transmitters and up to four 350 ohm load cells in parallel, thereby avoiding the need for an expensive external supply. When powering a load cell or potentiometer, a ratiometric operating mode can be selected, where the meter monitors the excitation supply and removes the effects of voltage variation.

In addition to the isolated excitation output, regulated 5 Vdc at up to 50 mA is brought out and can be used to power external logic.

Wiring of Excitation Output

4-Wire, 4-20mA Transmitter Wiring

2-Wire, 4-20mA Transmitter Wiring

• With four-wire transmitters, two wires are used to apply 10 or 24 Vdc, and two separate wires are used to sense the transmitter's 4-20 mA output.
• With two-wire transmitters, the same two wires are used to power the transmitter and carry the 4-20 mA output, which is made to flow across an internal 10 ohm resistor between pins 3 and 4.

Both power supplies and their connectors (standard) are designed to UL/IEC/CSA safety standards. The two supplies also do double-duty by providing two connector inputs (A & B) and a digital ground for signals such as meter hold, reset, tare, etc. These signals do not affect power supply operation.

 

OPERATING POWER
Module PS1 Module PS2 Frequency Power Consumption	85-264 Vac or 90-300 Vdc 12-32 Vac or 10-48 Vdc DC and 47-63 Hz 5.3 W max
PROTECTION
Module PS1 Module PS2	Module PS2 On-board fuse rated 0.5A, 277 Vac, UL Recognized On-board fuse rated 2.5A at 250 Vac or 63 Vdc, UL Recognized
EXCITATION POWER SUPPLY
Selectable Outputs	5 Vdc ± 5%, 100 mA 10 Vdc ± 5%, 120 mA 24 Vdc ± 5%, 50 mA
Ripple Isolation to Power Gound Isolation to Meter Ground	50 mVp-p max 250V rms working, 2.3 kV rms per 1 min test 50 Vp
PIN ASSIGNMENT (POWER & DIGITAL CONTROLS)

Micron MM50 Meter Dual or Quad Relay Option Modules

Dual 8A Contact Relays

Quad 8A Contact Relays

Dual 120mA Solid State Relays

Quad 120mA Solid State Relays

CE Mark

RoHs Mark

ETL Mark

Made in the U.S.A.

Electrical Connections

Form C (SPDT) dual contact relays Relays can be connected to be normally open (OC) or normally closed ($0). Relay grounds are mutually isolated.

Form A (SPST) quad contact relays Relays are normally open (NO). Each pair of relays shares an isolated ground.

Form A (SPST) dual solid state relays Relays are normally open (NO). Relay grounds are mutually isolated.

Form A (SPST) quad solid state relays Relays are normally open (NO). Each pair of relays shares an isolated ground.

Setpoint Operating Modes

Normal, Non-Latched Operation In this mode, the relay closes when the reading rises above the setpoint and opens when the reading falls below the setpoint. Relay ON/OFF control action is independently programmable for each of the two relays and can be reversed through a setup command.

Latched Operation The relay stays actuated until reset externally. This mode can be used to shut down machinery or a process when an operating limit has been exceeded, or to maintain an alarm until acknowledged by an operator when the alarm condition has passed.

Mixed Latched and Non-Latched Operation One of the relays can operate in a non-latched mode, for instance to turn off a heater when an operating temperature setpoint is reached. The other relay can operate as a latching fail-safe backup and turn off the entire process when a second, higher setpoint is reached, indicating a malfunction.

Deviation Mode Operation A deviation limit (50 in this example) is set up around both sides of the setpoint. The relay closes (or opens) when the reading falls within the deviation band, and opens (or closes) when the reading falls outside of this band. This mode sets up a passband around the setpoint and is often used for component testing.

Wide Hysteresis Mode Operation In this example, a hysteresis limit of 600 is set below the setpoint. The relay closes when the reading reaches a lower limit (the setpoint less hysteresis) and opens when the reading reaches an upper limit (the setpoint). One application is automatic tank filling. A fill operation is automatically initiated when the tank level has reached a lower level and is terminated when the level has reached an upper level.

Narrow Hysteresis Mode Operation Hysteresis can be used to minimize the number of ON/OFF control cycles around a setpoint, thereby increasing the life of motors, relays, etc. A very narrow hysteresis band (such as 5 counts) can also be used to minimize relay chatter around a setpoint due to electrical noise on the signal, or due to signal feedback caused by load switching. The hysteresis limit should exceed the noise amplitude.

Micron MM50 Meter 16-Bit Analog Output Option Module

16-Bit Analog Option Board

Key Features

• 16-bit resolution (1 part in 65,536 or 0.0015% of full scale)
• 4-20 mA, 0-20 mA, 0-10V, or bipolar -10 to +10V analog output
• Analog output linearized to reading
• Analog output isolated to 250 Vac
• ±0.02% full scale accuracy
• Scale and offset via meter front panel, RS232, RS485 or USB
• Certified to EN 61010-1 (CE mark) and RoHS
• Output derived from filtered or unfiltered signal input
• 12V compliance at 20 mA

CE Mark

RoHs Mark

ETL Mark

Made in the U.S.A.

Description

A 16-bit analog output option board can turn a Micron 1/8 DIN digital panel meter, counter, timer or remote display into a superb, isolated, linearized transmitter or signal conditioner with exceptional accuracy and high-speed response. The analog output for thermocouples, RTDs and custom curves is linearized to the displayed reading.

The analog output can be selected as 4-20 mA, 0-20 mA, unipolar 0-10V, or bipolar -10V to +10V with a 20V span and 0V at mid-range. If a voltage output is selected, output pins 1 and 2 may be reversed to provide reversed polarity.

A 16-bit D-to-A converter provides 0.0015% full-scale resolution and ±0.02% full-scale accuracy. The update rate for meters is a fast 60/sec for 60 Hz power or 50/sec at 50 Hz power. The analog output can track the unfiltered signal for fastest response, or a digitally filtered signal for best noise rejection.

Isolation from power and signal is provided by a separate power supply in the meter. This supply can drive 20 mA of current into loads up to 600 ohms for 12V compliance. Isolation to signal ground and power ground eliminates problems caused by ground loops.

Scaling of the analog output can be via the meter's front panel pushbuttons or a serial digital interface using Instrument Setup software. The displayed readings to produce the low and high analog outputs can be set to any value from -99999 to +99999 for DPMs or from -999999 to +999999 for counters and timers. Depending on your selected output range, simply set the meter reading for low analog output (4 mA, 0 mA, 0V or -10V) and for high analog output (20 mA or 10V).

The bipolar -10V to +10V analog output can provide a negative signal for a negative deviation from a setpoint, and a positive signal for a positive deviation. It can also be used for proportional control around a setpoint. For example, if proportional control is desired around 170°C with a ±10°C span, set the -10V output to 160°C and the +10V output to 180°C. The control signal will be 0V at 170°C.

Micron DIN rail transmitters come standard with a 4-20 mA, 0-20 mA, 0-10V, or bipolar -10 to +10V analog output with 16-bit resolution.

Specifications

Electrical
Power source		Provided by meter
Signal source		Filtered or unfiltered digitized signal
Output linearization		Linearized to reading
Output Levels (selectable)		4-20 mA, 0-20 mA, 0-10V, -10 to 10V
Compliance at 20 mA		12V ( 600 Ω max load )
Compliance at 10 V		2 mA ( 5 kΩ min load)
Isolation		250V rms working, 2.3 kV rms per 1 min test
Output resolution		16 bits (0.0015% of full scale)
Output nonlinearity		< 0.01% of full scale
Accuracy		< 0.02% of full scale
Output update rate, DPMs		50 or 60/sec (output may be digitally filtered)
Output update rate, counter rate meter		Gate time + 30 ms + 0-2 periods
Scaling
Zero output & full-scale output, DPMs		-99,999 to +99,999 counts
Zero output & full-scale output, counters		-999,999 to +999,999 counts
Minimum span		150 counts
J4 Pin Assignments
Unipolar Connections		Bipolar Connections
4-20 mA or 0-20 mA output 1		Reference or Return 1
0-10V output 2		-10V to +10V Output 2
Isolated ground 3		N/C 3

Micron MM50 Meter Serial Communication Option Modules

Serial Communication Option Boards

Key Features

• Communication boards available for RS232, RS485, USB, Ethernet
• Usable in all 1/8 DIN size Laureate DPMs, counters, timers & remote displays
• All boards fully support Modbus and Laurel Custom ASCII protocols
• User-selectable baud rates to 19,200
• Converter boards connect a USB or Ethernet line to RS485 bus with up to 31 meters
• Powered by instrument
• Isolated from meter and power grounds

CE Mark

RoHs Mark

ETL Mark

Made in the U.S.A.

Description

A serial communication option board allows a Micron digital panel meter, counter or timer to be interfaced to a PC for programming via Micron Windows-based Instrument Setup Software, or to output readings to a remote PC, PLC or other device with a serial communication port. The transmitted data may include the latest reading, peak value, valley value, alarm status, and setup information. The data can then be displayed, processed and data logged. The data can also be received by a Micron 6-digit remote display, which will display the serial data and also process the serial data to control relay outputs and generate a scaled, isolated 4-20 mA, 0-10V or -10V to +10V analog output.

If the primary objective is to program a meter directly from a PC using Instrument Setup Software, an RS232 or USB interface board is recommended, depending on the available PC port. Once the meter has been programmed, the interface board can be removed if no longer needed.

If the objective is to connect a network of meters to a PC, our USB 2.0-to-RS485 converter board can be used. That board can be connected to a PC via a USB port, and also act as the server for up to 31 meters on an RS485 bus via an RJ11 connector. The remote meters must be equipped with Micron RS485 interface board. That board features dual RJ11 connectors for RS485 daisy-chaining using commercial 6-wire RJ11 data cables, with no need for a hub.

If the objective is to connect meters to an existing Modbus RS485 bus, either of two RS485 interface board can be selected. Our RS485 Modbus interface board uses RJ45 connectors as recommended by the Modbus standard, while our RS485 interface board uses RJ11 connectors, which are also used for Modbus. Both boards are fully compatible with the Modbus RTU and Modbus ASCII protocols, as are all other Micron serial interface boards. Both RS485 boards provide dual connectors (RJ485 or RJ11) for RS485 daisy-chaining using commercial 6-wire data cables with the appropriate connector (RJ485 or RJ11), with no need for a hub.

If the objective is to connect a meter to an Ethernet LAN, our Ethernet interface board allows a meter to be connected to an available router port using a standard Ethernet cable. Our Node Manager software makes node discovery and setup exceptionally simple.

If the objective is to connect a network of meters to an Ethernet LAN, our new Ethernet-to-RS485 converter board should be selected. That board can be connected to an Ethernet LAN utilizing a single Ethernet cable and also act as the server for up to 31 meters on an RS485 bus via an RJ11 connector. The remote meters must be equipped with Micron RS485 interface board. The Ethernet-to-RS485 converter board features dual RJ11 connectors for RS485 daisy-chaining using commercial 6-wire RJ11 data cables, with no need for a hub. Our new Node Manager software makes meter discovery and setup exceptionally simple.

Three serial protocols are user-selectable: Modbus RTU, Modbus ASCII, and Micron ASCII. For more information, please see our Modbus Protocol Serial Communications Manual and our Serial Communications Manual.

• The Modbus protocol is an international standard and allows Microns to share the same RS485 data lines with non-Micron devices. It supports up to 247 digital addresses. Use of more than 31 Micron RS485 Modbus boards per line would require a repeater for impedance reasons.
• The Micron ASCII protocol is recommended if the only devices on the RS485 data line are Micron meters. It supports up to 31 digital addresses.

Quick Selection Guide

Interface Board Features & Compatibility	Ethernet Board	Ethernet Server	RS232 Board Board	USB Board	USB Server	RS485 Board	RS485 Modbus
Fits all 1/8 DIN Micron
Instrument Setup software
Modbus RTU & ASCII
Conversion to Modbus TCP
Laurel ASCII protocol
Networkable
Digitally addressable
Single or duplex RS485
RS485 converter capability
Main Serial I/O Connector	RJ45	RJ45	RJ11	USB	USB	RJ11	RJ45
Connectors for RS485 server		2 x RJ11			2 x RJ11

Specifications

Electrical Specifications

Communication Option Module Overview

Ethernet-to-RS485 converter board Provides an RJ45 connector to an Ethernet LAN plus an RJ11 connector to an RS485 bus. Supports Ethernet communications with the host meter or counter plus an additional 30 meters or counters on the RS485 bus.

RS232 interface board Single RJ11 connector for point-to-point data communications to a PC RS232 COM port. Compatible with 4- or 6-wire data cables.

RS485 interface board, dual RJ11 connectors Dual RJ11 connectors allow daisy-chaining without a hub. Jumper selectable 2-wire (half duplex) or 4-wire (full duplex) connection. RJ11 connectors allow use of commercial 6-wire data cables.

RS485 interface board, dual RJ45 connectors Dual RJ45 connectors for daisy-chaining without a hub. Jumper selectable 2-wire (half duplex) or 4-wire (full duplex) connection. RJ45 connectors conform to the Modbus standard (but RJ11 connectors are more popular).

USB 2.0 interface board Single USB Type-B receptacle for USB 2.0 I/O. Allows plug-and-pay connection of meter to a PC with a USB port.

USB 2.0-to-RS485 converter board Includes a USB Type-B receptacle for USB 2.0 I/O plus an RJ11 connector for RS485. Allows meter to communicate with a PC via USB while also serving as a USB-to-RS485 converter and server for up a 31-device RS485 network.

Signal Conditioner Boards

Four signal conditioner boards are selectable for DPMs:

• DC (volts, amps, mV, mA, process, potentiometric ratio).
• AC True RMS (AC volts, mV, amps, mA).
• Thermocouple (Types J, K, T, E, N, R, S)
• RTD (Pt 100, Ni 120, Cu 10) and Ohms (2 Ω to 2 MΩ ranges)
• Load cell (load cell, strain gauge, scale meter, microvolts).

Three input boards are selectable for counters:

• Frequency, period, rate (dual pulse inut channels A & B, 0.005 Hz to 1 MHz)
• Digital stopwatch (for single or accumulated events)
• Time interval meter (for average of periodic events)
• Power factor & phase angle meter (for AC signals)
• Duty cycle meter (or or off period as a percentage of total period)
• Up / down totalizer (with dual channels A & B, with external inputs for external control)
• Ratio, draw, channels A+B, A-B, AxB, A/B, A/B-1 (arithmetic operations on dual pulse input channels A & B)
• Batch controller (to control recurring fill operations from pulse inputs)
• Voltage-to-frequency converter (rate, total, batch control from analog inputs)
• Quadrature meter / controller (position or rate from encoder signals)

If you have additional Question on the MM50 Meters, send us a message via our contact page.

Micron MM50 1/8 DIN Case

For Micron Digital Panel Meters, Counters, Timers & Remote Displays

Key Features

• Meets 1/8 DIN Standard.
• Installs from front of panel.
• Short depth behind the panel: only 4" (102 mm) plus connectors.
• Understated 0.157" (4 mm) thick bezel.
• Meets NEMA 4X (IP-65) for high-pressure wash-down when panel mounted.
• Screw clamps connectors meet VDE / IEC / UL / CSA safety standards.
• Rugged GE Lexan® housing material.
• Safety certified per EN 61010-1.