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SHEET: 2 OF 16

104 Racquette Drive

Fort Collins, CO 80524

(970) 484-6510 Phone

(970) 484-6650 Fax

www.rletech.com

FMS Sensor Wiring Guide

10061_FMS Rev 2.0 (8/13)

FMS to T120D Integration

VDC

TB 1

VDC

+ -

EXTERNAL

24VDC

+ +

Ch1

+ -

Ch2

+ -

Ch3

+ -

Ch4

+ -

TB 2 Inp ut 1-4

Ch5

+ -

Ch6

+ -

Ch7

+ -

TB 3 Inp ut 5-8

Ch8

+ -

EXTERNAL

GND

- -

TB 4

NC NO C

RELAY 1

NC NO C

RELAY 2

PWR(4-20 S END)

COMMON

RH OUT (4-20 RTN)

T OUT (4-20 RTN)

RTD/OVERRIDE

SLIDER RIGHT

SLIDER WIPER

SLIDER LEFT

BACK P IECE CENT ER PIECE (WITH CIRCUIT BOARD)

SW1

mAVolts

TEMP 10/5V

TEMP RA NGE

50-95/32-122

TEMP F/C

Out put Select

Figure 2.2: 50-95F Range Setup

Figure 2.3: 32-122F Range Setup

RH 10/5V

1. Set the switch position to mA. Set the temperature range to

50-95 or 32-122. The sensor is shipped from the factory with

the switch in the volts position and the temperature range is

set for 50-95F. The switch position must be set to the mA

position.

2. Wire the sensor to the CH # being used.

4. Verify the "Calc" value displays the correct room temperature.

The temperature can also be viewed on the Falcon main page.

SETUP

1. Calculate the T120D Output current for temperature.

TROUBLESHOOTING

2. Measure the current flowing into the Falcon Ch- terminal with a

current meter. Verify that it is close to the calculated current (+/-

1%).

3. If measured current does not match calculated current then

check wiring and check T120D jumper and switch

settings.

4. Compare the measured current matches the current reading in

the Falcon.

5. Check the wiring if the Falcon current reading does not match

the measured current reading.

6. If the Falcon current reading matches the measured current

and the Falcon Calculated value does not match the room

temperature then the offset and gain values are wrong.

Double check the Gain and Offset values.

7. If the temperature displayed in the Falcon is 1 or 2 degrees

above or below the room temperature then adjust the offset by

1 or 2. Do not adjust the gain. Only tweak the offset once the

previous troubleshooting steps have been performed.

8. If the Falcon still does not display the correct temperature

contact RLE Technologies technical support at 970.484.6510.

Figure 2.1: FMS Wiring with the T120D

3. Configure the Falcon Input channel (temperature) for "Analog

4-20mA" and enter the Gain and offset values. For the 50-95F

range use Gain 11.25, Offset 38.75. For 32-122F range use

Gain 22, Offset 10.

Example if Room Temp is 70F and your sensor has a range of 50-95

( (Actual temp - Sensor Low) / (Sensor High - Sensor Low)) x 16 + 4

( (70 - 50) / (95 - 50)) x 16 + 4 = 11.11

Formula for calculating the correct RAW value

1 2 3 4 5 6 7 ... 15 16

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