Dwyer Mark User Manual
Page 18
17
MARK 1, 3 AND 4 TRANSMITTER WITH HART
®
COMMUNICATION INSTALLATION
Models 19XXX, 39XXX and 49XXX Rotary Position Indicating Switches contain a 4-20 mA Transmitter with HART
®
communication and two Single Pole Double Throw (SPDT) Micro switches. Models 190XX, 390XX and 490XX contain
a 4-20 mA transmitter with HART
®
communication only, no switches.
•
4-20 mA output is fully adjustable for various rotations (zero and span) using pushbuttons or a HART
®
communication master.
• 4-20 mA circuit is polarity insensitive and thermal protected. Though the output terminals are labeled (+) and (-) the
transmitter will function if the terminals are reversed.
•
Clockwise or counterclockwise rotation corresponding to increased current output can be selected by use of zero
and span pushbuttons or a HART
®
communication master.
INSTALLATION AND ADJUSTMENT
1. Attach the switch to the actuator or valve. Refer to Installation and Adjustment instructions:
p. 9 for Direct Drive Mark 1 and 4 Models
p. 10-11 for Lever Drive Mark 1 and 4 Models
p. 12-13 for Mark 3 Models
2. Remove cover by unscrewing. Take care to keep threads clean and free from damage.
3. On models 19XXX and 49XXX, the switches are set at the factory when in the counterclockwise position as shown.
Switch #1 is open, and #2 is closed. When cams are rotated 90º clockwise, #1 becomes closed and #2 is open.
The cams may be adjusted to increase or decrease the 90º rotation. For model 39XXX refer to pages 12 and 13
for Switch Adjustment Procedure.
4. The potentiometer is positioned at the factory with the resistance element approximately centered.
1
2