Myron L 729II - Manual (Page 48)

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IV. OPERATING PROCEDURES
A. FRONT PANEL
The front panel illustrations to the right, switch and indicator
operational descriptions have been provided to assist the user in
identifying and operating the 720 Series II Monitor/controllers.
For OEM models see Section B.
Refer to Section IV.C for Setup procedures and Section IV.D for
Check-Out procedures.
1. RED “HIGH SET POINT” LED INDICATOR
The red LED indicator light is ON only when the water’s pH or ORP
reading is HIGH or ABOVE the set point adjustment. May be
reversed if desired.
2. GREEN “LOW SET POINT” LED INDICATOR
The green LED indicator light is ON only when the water’s pH or
ORP reading is LOW or BELOW the set point adjustment. May be
reversed if desired.
3. “SET POINT” SWITCH(ES)
When the “SET POINT” switch is depressed, the internal set point
reading is immediately displayed on the front panel display. See
figures IV.A.1 thru 4.
4. ANALOG METER OR DIGITAL LCD
Front panel analog meter or digital display provide a continuous
readout of the water being monitored.
pH Models 721II & 722II and ORP Models 726II & 727II are
equipped with analog meter only. See figures IV.A.4 & 5.
pH Models 723II & 724II and ORP Models 728II & 729II are
equipped with a 3 1/2 digit, 1/2” Liquid Crystal Digital Display, as
shown in figures IV.A.1 thru 3, with a 3 1/2 digit backlit LCD as an
option.
5. OPTIONAL FRONT PANEL ITEMS
TP/TPO Module Switch
A digital Monitor controller with the optional TP/TPO Temperature
Module, see picture at right, has an additional switch on the front
panel. This push-button momentary switch when pushed gives
the user a direct reading of the temperature of the solution from 0-
200°C. Additional option TH/THO includes a control function
capability. Mounts in the lower left corner of the upper panel, see
figure IV.A.1.
7pH or ZEROmV Test Switch (TEST)
This optional feature allows the user to see the ZERO TEST value
without opening the enclosure to push the internal switch. Mounts
in the lower left corner of the upper panel, see figure IV.A.3.
unless ordered with TP Module than 7pH or ZEROmV Test Switch
(TEST) mounts in the lower center of the upper panel, see figure
IV.A.1.
Piezo Alarm
Audible alarm sounds off automatically when the set point is
reached. Figure IV.A.3. shows the location of this option.
Analog pH
Monitor/controller
(Single Alarm/control)
Digital pH
Monitor/controller
with optional Dual
Alarm/controls
Digital ORP
Monitor/controller with
optional Front Panel
Test Switch, Single
Alarm/control, and
Piezo Alarm.
Analog
ORP
Monitor
Digital pH
Monitor/controller
with optional
Dual Alarm/controls,
and Temperature with
control function, and
Front Panel Test Switch.
726II
722II
728II-PTS-PA
723II-SC
723II-SC-TP-THH-PTS
Figure IV.A.1
720II
HIGH
LOW SET POINT
TEMPERATURE
TEMPERATURE
TEST
pH
MYRON L
COMPANY
Figure IV.A.2
720II
HIGH
LOW SET POINT
pH
MYRON L
COMPANY
Figure IV.A.3
HIGH LOW
SET POINT
720II
ORP
TEST
MYRON L
COMPANY
Figure IV.A.4
720II
HIGH LOW
SET POINT
0 14
12
6
2
8 10 4
pH
MYRON L
COMPANY
Figure IV.A.5
720II
ORP
2 2
1.5
.5
1.5
.5 1 1
0
X1000
MYRON L
COMPANY