Dwyer Mark - Manual (Page 16)

15
MARK 1, 3 AND 4 WITH TRANSMITTER INSTALLATION
1 2 3
1
2
CLOCKWISE
ROTATION
Models 15XXX, 35XXX and 45XXX Rotary Position Indicating Switches contain a 4-20 mA Transmitter and two Single
Pole Double Throw (SPDT) Micro switches. Models 150XX, 350XX and 450XX contain a 4-20 mA transmitter only, no
switches.
• 4-20 mA output is fully adjustable for various rotations (zero and span). See chart above for rotation ranges using
various potentiometers.
• 4-20 mA circuit is supply reversal protected and thermal protected.
• Clockwise or counterclockwise rotation corresponding to increased current output can conveniently field selected
with plug connector.
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 15XXX and 45XXX, 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 35XXX refer to pages 12 and 13
for Switch Adjustment Procedure.
4. The potentiometer is positioned at the factory with the resistance element approximately centered.
Potentiometer
Resistance Ohms
1000
2000
Ohms Per
Degree of
Rotation
2.9
5.8 Rotation Range
Mark 1 & 4 Mark 3
Min
50°
25° Max
300°
150° Min
1.5 turns
.75 turns Max
8.5 turns
4.3 turns