Myron L 750 II Series - Set Point Conversion (SPC); Reversing Set Point

20
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. Use alcohol, if possible.
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 750 Series II Conductivity/TDS
Monitor/controllersareconguredtotriggerthealarmrelayas
the Conductivity/TDS reading increases.
NOTE: On Resistivity Monitor/controllers the reverse is true, as
the reading decreases the alarm/control will trigger/sound.
Iftheuser’sapplicationrequiresit,thealarm/controlcircuit
maybeeasilyreconguredtotriggerthealarm/controlrelayas
the Conductivity (or ppm) reading decreases, or increases for
Resistivity.RefertogureIII.A.4forthelocationsoftheSPC
jumpers referred to in this section.
Figure III.A.2
SWITCH
FRONT PANEL
BEZEL
NUT
PUSH
BUTTON
O-RING
O-RING
Switch / O-ring Assembly
Figure III.A.3
BK WT RD GN NU R- R+
RELAY #1
}
COM
{
POWER
AC LINE/DC+
AC NEUTRAL/DC-
GROUND
SET POINT #1
CONVERSION
CHS GND
HYS1SP1FS SW
FUSE*
115/
230
NC NO
-121
2000µS
UP
}
DIS
CAL
3S
PA
RA
REMOVE JUMPER TO
INSTALL SC/SCO
SECOND ALARM/CONTROL
MODULE
SET POINT #1 HYSTERESIS
RIGHT INCREASING /
LEFT DECREASING
FULL SCALE
PUSH TO TEST
SET POINT #1 (low)
ADJUST
INC
DEC
SPC
751 756
752 757
753 758
754 759
SOLID STATE OUTPUT
(24VDC 30mA)
PIEZO ELECTRIC ALARM - PA™
OR
REMOTE ALARM - RA™ OR
CUSTOMER CONNECTION
PWR C GD NC NO CM
TRANSFORMER
REMOVE TO INSTALL
SECOND RELAY