User Manual

Front Panel
WARNING: there are two (2) O-rings installed on the switches,
one (1) on the shank and the other is under the push button. Both
of these O-rings must be reinstalled to maintain IP65/NEMA 4X
ratings.SeegureIII.A.3.
1-4 assumes this is a conversion from a single alarm/control.
Skip to #5 if new installation or assembly.
1. Carefully remove the RED LED from the front panel by
pulling lightly on the wires. It may be necessary to use a
  smallatscrewdrivertoslightlyspreadtheretaining
ring.
2. Remove the set point switch from the front panel by
rotating the round bezel nut CCW on the front panel, see
  gureIII.A.4.
3. Remove the LOWER front label.
4. Clean off remaining adhesive, if possible with alcohol.
5. Install DUAL alarm LOWER label, P# L2ALARM.
6. Install the SCO Second Alarm/Control RED LED in the
  UPPERpositionasshowninguresIII.A.5&III.A.6.
7. Install the SCO Second Alarm/Control Set Point Switch
in the UPPER center position.
8. Re-install #1 (original) Set Point Switch in the LOWER
center position.
9. Re-install the #1 (original) RED LED in the LOWER
position.
10. The GREEN LED stays in the same location.
a. Set Point Conversion (SPC) /
Reversing Set Point
The alarm/control circuit(s) on all 720 Series II pH and ORP
Monitor/controllersareconguredtotriggerthealarmrelayasthe
reading increases.
If the user’s application requires it, the alarm/control circuit may
beeasilyreconguredtotriggerthealarm/controlrelayasthepH
(orORP)readingdecreases.RefertogureIII.A.4forthe
locations of the SPC jumpers referred to in this section.
20
Figure III.A.2
SET POINT #1
CONVERSION
FUSE*
115/
230
TRANSFORMER
RELAY #1
}
COM
{
POWER
AC LINE/ +DC
AC NEUTRAL/ -DC
GROUND
NC
NO
SOLID STATE (24VDC 30mA) OUTPUT
PA™ PIEZO ELECTRIC ALARM OR
RA™ REMOTE ALARM OR
CUSTOMER CONNECTION
PA
REMOVE JUMPER TO INSTALL SC/SCO
SECOND ALARM/CONTROL MODULE
721 726
722 727
723 728
724 729
MYRON L
COMPANY
UP
}
3S
INC
SPC
CONFIGURATION
MODULE
SPAN
ZERO
HYS1
SP1
ZERO
DO NOT
ADJUST
pH
SET POINT #1 (high)
ADJUST
SET POINT #1
HYSTERESIS
RIGHT INC
LEFT DEC
7 pH/ZERO mV
PUSH TO TEST
SPAN (GAIN )
PUSH TO TEST
DIS
ORP ZERO
PWR C GD NC NO CM
SPAN
DEC
GND CHS
RAPA
REMOVE TO
SECOND RELAY
INSTALL
pH
}
BK WT RD GN NU R- R+
SWITCH
FRONT PANEL
BEZEL
PUSH
BUTTON
O-RING
O-RING
Switch / O-ring Assembly
Figure III.A.3