Myron L 729II - Manual (Page 49)

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H. 3 SENSOR / 3 RANGE MODULE
3SRO 3 Sensor / 3 Range Switch Module with 3 foot / 1 meter
cable ordered separately (customer installed and
mounted).
3SRE 3 Sensor / 3 Range Switch 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 / 3 Range Switch Module is a circuit board (CB) with 2
rotary switches, and 3 groups of 5 sensor
connectors where up to three sensors may be connected.
The 3SR will function with all Conductivity/TDS and Resistivity
models, analog or digital. For ease of description, 3SR will be
used throughout, and in the following description each switch
function will be described separately.
The 3 Sensor Switch allows the user to view 3 separate sensor
locations and to set the alarm/control function using only one
Monitor/controller.
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 NO ALARM or CONTROL. However, any
of the sensor positions many be selected to control by resetting
the select switches as shown on the CB and described below.
The 3 Range Switch allows the user to select which “range”
(Cond/TDS = X1, X10 or X100 / RES X1, X.1 or X.01) to view,
and to set for alarm/control function. The 3R may be configured
- via select switches - to disable or stop the alarm/control func-
tion from operating when changing ranges.
It is available in multipliers of “10” only.
Example #1 - Conductivity/TDS: 758II-117-3R = 500µS (X1)
w/ 5000µS (X10) & 50mS (X100) additional ranges.
Example #2 - Resistivity: 753II-11-3R = 20MΩ (X1) w/ 2MΩ
(X10/X.1) & 200KΩ (X100/X.01) additional ranges.
As shipped from the factory, the number “1” Range position is
the primary or the alarm/control position while the other posi-
tions are monitoring ONLY. In other words, while in the #2 (X.1)
or #3 (X.01) position the alarm/controller is disabled. In the
above example #2 the 20MΩ (X1) is the primary or alarm/control
range.
NOTE: It is NOT possible to have different alarm/control settings
for each sensor and range combination. The alarm/control func-
tion will always be the same as a percentage of full scale.
Specifications
NONE
2. INSTALLATION
Briefly -
The 3SR & 3SRO must be installed/mounted by the user out-
side of the Monitor/controller enclosure by drilling two (2) holes
in user panel. For the 3SRE, a cutout the size of the enclosure
is required.
A five conductor cable is connected to the 3SR Switch Module.
This cable is connected to the main Monitor/controller circuit
board (CB) at the sensor input connectors.
On a Conductivity Monitor/controller, the Range Module is
removed from Monitor/controller CB and re-installed on the 3SR
Switch Module as marked.
On a Resistivity Monitor/controller the Range Module is re-
moved from Monitor/controller CB and a special 3 Range-Range
Module is installed on the 3SR Switch Module as marked.
A cable harness from the 3SR Switch Module is connected to
the main Monitor/controller circuit board in place of the Range
Module.
A separate 2 wire connector & harness is for the alarm/control
disable or kill, and attaches to the small 2 pin male connector
S3 located to the left of the large input sensor connectors on
the main control 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
3SRO Switch Module only - A suitable location must be found
that is both convenient to the user plus allows sufficient clear-
ance for both switches and the CB to clear any obstructions.
3SRE - 3 Sensor / 3 Range Module with enclosure, a cutout the
size of the enclosure is required. Install enclosure per Operation
Manual and skip to #4 below.
1. Two 3/8” (9.5mm) holes must be drilled on 2” (26mm)
centers in the “user” panel. These holes must be
situated in a location that allows the 3SR Switch
Module to be mounted.
2. Install label, aligning on the drilled holes.
3. Mount the 3SR Switch Module to the panel with
hardware supplied.
4. Attach 5 wire cable harness from the 3SR Switch
Module to the main Monitor/controller CB at the sensor
input location as shown on connector label.
5. Remove the Range Module from the Main
Monitor/controller CB.
6. For Conductivity models, re-install Range Module onto
the 3SR Switch Module in the LEFT location as
marked.
For Resistivity models install replacement SPECIAL 3
Range-Range Module, part number RM-18 onto the
3SR Switch Module in the LEFT location.
7. Attach cable harness from the 3SR Switch Module
to the main Monitor/controller CB in the place of the
removed Range Module, as shown in figure III.H.1.
8. Attach the separate small cable harness from the 3SR
Switch Module to the small 2 pin male connector
located to the left of the sensor input connectors on
the main CB, as shown in figure III.H.1. NOT
INSTALLED ON MONITOR ONLY MODELS.
!
CAUTION - READ FOLLOWING CAREFULLY