INSTRUCTION MANUAL

RTD TRANSMITTERBEFORE USE ....
Thank you for choosing us. Before use, please check contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact our sales office or representatives.
■ PACKAGE INCLUDES:
Signal conditioner................................................................(1)■ MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.
■ INSTRUCTION MANUALThis manual describes necessary points of caution whenyou use this product, including installation, connection andbasic maintenance procedures.

POINTS OF CAUTION■ CONFORMITY WITH EU DIRECTIVES• This equipment is suitable for Pollution Degree 2 and Installation Category II (transient voltage 2500V). Reinforced insulation (signal input or output to power input:300V) and basic insulation (signal input to output: 300V)
are maintained. Prior to installation, check that the insulation class of this unit satisfies the system requirements.
• Altitude up to 2000 meters.
• The equipment must be mounted inside a panel.
• The equipment must be installed such that appropriate
clearance and creepage distances are maintained to conform to CE requirements. Failure to observe these requirements may invalidate the CE conformance.
• The actual installation environments such as panel configurations, connected devices, connected wires, may affect the protection level of this unit when it is integrated
in a panel system. The user may have to review the CE
requirements in regard to the whole system and employ
additional protective measures to ensure the CE conformity.
• Install lightning surge protectors for those wires connected to remote locations.

MODELM3SRS■ POWER INPUT RATING & OPERATIONAL RANGE• Locate the power input rating marked on the product andconfirm its operational range as indicated below:
100 – 240V AC rating: 90 – 264V, 47 – 66 Hz, approx. 2 – 4VA
24V DC rating: 24V ±10%, approx. 1W
24 – 240V DC rating: 21.6 – 264V, approx. 1W■ GENERAL PRECAUTION• Before you remove the unit or mount it, turn off the power
supply and input signal for safety.
• Pulling the front part of the unit forcibly may separate
the front housing from the body housing. Touching exposed internal power/input terminals may cause an electric shock if the unit is powered.
■ ENVIRONMENT• Indoor use.
• When heavy dust or metal particles are present in theair, install the unit inside proper housing with sufficientventilation.
• Do not install the unit where it is subjected to continuousvibration. Do not subject the unit to physical impact.
• Environmental temperature must be within -10 to +55°C(14 to 131°F) with relative humidity within 30 to 90% RH
in order to ensure adequate life span and operation.
• Be sure that the ventilation slits are not covered with cables, etc.
■ WIRING• Do not install cables close to noise sources (relay drive
cable, high frequency line, etc.).
• Do not bind these cables together with those in which
noises are present. Do not install them in the same duct.
■ AND ....
• The unit is designed to function as soon as power is supplied, however, a warm up for 10 minutes is required forsatisfying complete performance described in the data
sheet.
• With voltage output, do not leave the output terminals
shortcircuited for a long time. The unit is designed toendure it without breakdown, however, it may shorten appropriate life duration.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7712 Rev.5

P. 1 / 4

M3SRSCOMPONENT IDENTIFICATIONINSTALLATION■ DIN RAIL MOUNTING
Set the unit so that its DIN rail adaptor is at the bottom.
Position the upper hook at the rear side of the unit on theDIN rail and push in the lower. When removing the unit,
push down the DIN rail adaptor utilizing a minus screwdriver and pull.

BodySpecifications(side)DIN Rail
35mm wide

Front CoverFront Housing■ FRONT PANEL CONFIGURATIONPower LED
Zero Adj.
Span Adj.

1234

Spring Loaded
DIN Rail Adaptor■ HOW TO SEPARATE THE TERMINAL BLOCKS
When you need to separate the terminal blocks from thetransmitter body for wiring, insert a minus driver between
the terminal block and the housing body, pull up the driverand pull out the terminal block.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7712 Rev.5

P. 2 / 4

M3SRSTERMINAL CONNECTIONSConnect the unit as in the diagram below or refer to the connection diagram on the side of the unit.
■ EXTERNAL DIMENSIONS unit: mm (inch)

8561234

DIN RAIL
35mm wide62 (2.44)

106 (4.17)712(.47)[5 (.20)]110.5 (4.35)• When mounting, no extra space is needed between units.

■ CONNECTION DIAGRAM
RTD

A

1

■ WIRING INSTRUCTIONS• Applicable wire size		Solid:

5 +B

26 –B

47 U(+)
8 V(–)OUTPUT

POWER

0.2 to 2.5 mm2 (0.55 to 1.75 dia.)		Stranded: 0.2 to 2.5 mm2					Tinning wire ends may cause contact failure
and therefore is not recommended.			 Ferruled: 0.2 to 1.5 mm2 (0.55 to 1.35 dia.)					The following Phoenix Contact terminals arerecommended:					AI 0,25-8YE

0.2 to 0.25 mm2					AI 0,34-8TQ

0.25 to 0.34 mm2					AI 0,5-8WH

0.34 to 0.5 mm2					AI 0,75-8GY

0.5 to 0.75 mm2					AI 1,0-8RD

0.75 to 1.0 mm2					AI 1,5-8BK

1.0 to 1.5 mm28 mm

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN

Recommended
ferruled wire

4 mm dia.
max.

Wire exposure

4 mm dia.
max.

• Expose wire conductors by 8 mm (0.31”).

8 mm

EM-7712 Rev.5P. 3 / 4

M3SRSCHECKING
1) Terminal wiring: Check that all cables are correctly connected according to the connection diagram.
2) Power input voltage: Check voltage across the terminal
7 – 8 with a multimeter.
3) Input: Check voltage across the terminal 1 – 2 with asensitive voltmeter.
(With 20°C or 68°F, approx. 140mV with Pt 100, approx.
70mV with Pt 50 Ω.)
If RTD wires are broken, the output goes over 100% (below 0% with downscale protection) due to burnout function. Check leadwires in such a case.
4) Output: Check that the load resistance meets the described specifications.

ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any calibration.
For matching the signal to a receiving instrument or in caseof regular calibration, adjust the output as explained in thefollowing.
■ HOW TO CALIBRATE THE OUTPUT SIGNAL
Use a signal source and measuring instruments of sufficientaccuracy level. Turn the power supply on and warm up formore than 10 minutes.
1) ZERO: Apply 0% input and adjust output to 0%.
2) SPAN: Apply 100% input and adjust output to 100%.
3) Check ZERO adjustment again with 0% input.
4) When ZERO value is changed, repeat the above procedure 1) – 3).

MAINTENANCE
Regular calibration procedure is explained below:■ CALIBRATION
Warm up the unit for at least 10 minutes. Apply 0%, 25%,50%, 75% and 100% input signal. Check that the output
signal for the respective input signal remains within accuracy described in the data sheet. When the output is out oftolerance, recalibrate the unit according to the “ADJUSTMENT PROCEDURE” explained earlier.

LIGHTNING SURGE PROTECTION
We offer a series of lightning surge protector for protection against induced lightning surges. Please contact us tochoose appropriate models.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7712 Rev.5P. 4 / 4