Myron L 729II - Manual (Page 44)

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F. 3 SENSOR INPUT MODULE
3SO 3 Sensor Input Module with 3 foot / 1 meter cable
ordered separately (customer installed and
mounted).
3SE 3 Sensor Input Module with 3 foot / 1 meter cable
AND separate Enclosure (as an accessory).
Enclosure is the same size as the
Monitor/controller - 4.8”W x 6”H x 3.9”D.
1. DESCRIPTION
3 Sensor Input Module is a circuit board (CB) with a 4 pole 3
position rotary switch, and 3 groups of 5 connectors where up
to three sensors may be connected. This option allows the user
to view 3 separate sensor locations and to set the alarm/control
function using only one Monitor/controller. The setpoints will not
change nor are they separately adjustable for each sensor.
As shipped from the factory, the number “1“ sensor position is
set to be the primary or the controlling sensor while the other
sensor positions are monitoring ONLY. This feature disables or
stops the alarm/control function from operating when changing
sensors. In other words, while in the #2 or #3 position the alarm/
controller is disabled. However, any of the sensor positions may
be selected to control by resetting the SELECT SWITCHES as
shown on the CB and described below. The 3S will function with
all Conductivity/TDS and Resistivity models, analog or digital.
Specifications
NONE
2. INSTALLATION
Briefly -
The 3SO must be installed/mounted by user outside of the
Monitor/controller housing by drilling a hole in user panel. For
the 3SE, a cutout the size of the enclosure is required.
A five conductor cable is connected to the 3S Module CB. This
cable is connected to the main Monitor/controller circuit board
(CB) at the sensor input connectors.
A separate small connector & harness is for the alarm/control
disable or kill, and attaches to the small 2 pin male connector
located to the left of the large sensor input connectors on the
main CB. NOT INSTALLED ON MONITOR ONLY MODELS.
WARNING: BEFORE STARTING, IF MONITOR/
CONTROLLER IS INSTALLED, ENSURE THE POWER
IS OFF. FAILURE TO DO SO COULD CAUSE DAMAGE
TO THE INSTRUMENT, AND COULD BE HARMFUL
OR FATAL TO PERSONNEL. ONLY QUALIFIED
PERSONNEL SHOULD INSTALL OR SERVICE
ELECTRICAL EQUIPMENT.
Physical
3SO Module only - A suitable location must be found that is both
convenient to the user and allow sufficient
clearance for the 3 Sensor Switch Module to clear obstructions.
3SE - 3 Sensor Switch Module with enclosure, a cutout the size
of the enclosure is required. Install enclosure per Operation
Manual, and skip to #4 below.
1. A 3/8” (9.5mm) hole must be drilled in the “user” panel.
This hole must be situated in a location that allows the
3 Sensor Input Module to be mounted.
2. Install label, aligning on the drilled hole.
3. Mount the 3 Sensor Input Module to the panel with
hardware supplied.
4. Attach 5 wire cable harness from the 3 Sensor Input
!
CAUTION - READ FOLLOWING CAREFULLY
SENSOR
SWITCH
SENSOR 1 SENSOR 2 SENSOR 3
3SR MODULE
3S
ON
COND
RES
X1
X10
X100
S1
S2
S3
SENSOR 1 SENSOR 2 SENSOR 3
SELECT
SWITCH
TO SENSOR INPUT
SENSOR
OUTPUT
SENSOR INPUT
3 S
MAIN CIRCUIT BOARD
BACK/CONNECTOR SIDE
NOT INSTALLED ON
MONITOR ONLY MODELS
3 SENSOR INPUT MODULE (3S/3SO)
BK WT RD GN NU R- R+
BK WT RD GN NU BK WT RD GN NU BK WT RD GN NU
3 SR MODULE
SENSOR 1 SENSOR 2 SENSOR 3 SELECT SWITCH
ON
COND RES X1 X10 X100 S1 S2 S3
3
S
Figure III.F.1
SENSOR OUTPUT