Murphy Network Card RTDT Series User Manual

RTDT-96091N  
Revised 01-01  
Section 10  
RTD Transmitter Installation Instructions  
RTDT Series Models  
00-02-0849  
Please read the following information before installing. A visual inspection of this product for damage during shipping is recommended  
before mounting. It is your responsibility to have a qualified person install this unit and make sure it conforms to NEC and local codes.  
GENERAL INFORMATION  
Power Supply Voltage  
Resistive Load  
(Minimum)  
(Maximum)  
V= (0.02 A x RL) +13 V  
RL=(V - 13) /0.02  
Example:  
Example:  
WARNING  
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT  
550 ohm load  
24 VDC power supply  
V=0.02 x 550 +13  
V= 24 VDC minimum power supply  
RL=(24 V - 13 V) /0.02  
RL=550 ohm maximum  
Dimensions  
0.138 in. (3.50 mm)  
Disconnect all electrical power to the machine.  
Make sure the machine cannot operate during installation.  
Follow all safety warnings of the machine manufacturer.  
Read and follow all installation instructions.  
NOTE  
1.080 in.  
(27.43 mm)  
0.67 in.  
ZERO  
Rlin  
SPAN  
(17.1 mm)  
0.14 in.  
(3.55 mm)  
Description  
The Murphy RTD transmitter is designed to accept a signal from an RTD sensing  
element, and to provide a linearized 4 to 20 mA output current. The output cur-  
rent is directly proportional to the temperature of the RTD temperature sensor.  
Since the temperature is converted to a current signal, voltage drops in the power  
supply leads to the transmitter have no effect on the integrity of the signal. As long  
as the transmitter has sufficient DC voltage at its terminals, it will produce a cur-  
rent linearly proportional to temperature. This means that the transmitter may be  
remote mounted but should be near the sensor, reducing the effects of noise and  
minimizing errors due to long leads on the RTD sensor. The RTD instruments  
have screw terminal connections and accept 2 or 3 wire RTD's* . They include  
high resolution, 24-turn zero and span potentiometers and each unit is calibrat-  
ed after a minimum of 48 hours burn-in and checkout time.  
1.50 in. (38.1 mm) Max.  
2.20 in. (55.8 mm) Max.  
NOTE: Slot accepts 6-32 screw  
Wiring  
CAUTION: Do Not connect power to the RTD input. Do Not  
connect power to the RTD itself. Do Not use AC line power.  
The terminal strip on the transmitter accepts 14 to 22 gauge wires. Copper wire is  
to be used since special compensation wire is not required. Route all transmitter  
wiring in separate conduit to isolate it from high voltage or high current carrying  
lines. It is also recommended that shielded wire be used for the 4-20 mA signal.  
*Three wire RTD's compensate for leadwire resistance.  
RTD  
+
Indicator --  
Controller  
--  
Specifications  
White  
Red  
Red  
DC Power Supply  
Sensor Input: Platinum RTD 100 ohms  
Output Span: 4 to 20 mA  
+
Loop Power Supply Voltage: Typically 24 VDC; when using Loop Resistance  
Graph 13 – 40 VDC.  
Temperature Span: 50°F (28°C) minimum; 1000°F (556°C) maximum  
Calibrated Accuracy: 0.1 %  
ZERO  
Rlin  
SPAN  
Conformity: 0.1 % of Span  
Ranges: -60 to 140°F; 0 to 400°F  
Ambient Temperature Limits: -30 to 165°F (-34 to 74°C)  
Power Supply Effect: 0.001% volt  
Current: 3.4 mA minimum; 30 mA maximum.  
Upscale Burnout: Standard  
Reversed Polarity Protection: Standard  
Nominal Zero and Span Adjustments: 10%  
Connections: Screw Terminal  
Loop Resistance Graph  
Supply voltage for the RTDT must be within 13-40 VDC. The figure below shows  
the minimum supply voltage (VDC) required for a given load resistance (RL).  
1500  
1000  
33V,  
Power Supply  
1000  
Under  
Transmitters are designed for a nominal 24 VDC power supply. They will  
operate with a 13 to 40 VDC supply at the transmitter power supply terminals.  
Use the following formulas to determine maximum resistive loading (RL)  
allowed for the power supply used, or to determine minimum supply voltage (V)  
required for fixing resistive loads. Formulas assume a max. current of 20 mA.  
Over  
Voltage  
Voltage  
Area  
23V, 500 Ω  
Area  
500  
250  
Operating  
Area  
18V, 250 Ω  
NOTE: Devices such as Murphy’s EMS Series controllers, 400 and 500 Series PLC  
0
10 13  
20  
30  
40  
50  
18  
controllers, and the RMU16 have 250 ohms resistors that add to the resistve loading.  
Power Supply Voltage (VDC)  
*NOTE: Cable resistance effect included in RL.  
 

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