Myron L 729II - Manual (Page 47)

43
G. 3 RANGE SWITCH MODULE
3RO 3 Range Switch Module with 3 foot / 1 meter cable
ordered separately (customer installed and
mounted).
3RE 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
The 3 Range Switch Module (3RO or 3RE) is a circuit board
(CB) with a 3 position rotary switch. This option allows the user
to select which range to view, and to set for alarm/control func-
tion. The 3R may be configured - via select switches - to disable
or stop the alarm/control function from operating when chang-
ing ranges. The 3R will function with all Conductivity/TDS and
Resistivity models, analog or digital.
NOTE: the setpoint(s) are NOT separately adjustable for each
range.
It is available in multipliers of “10” only.
Example #1 - Conductivity/TDS: 758II-117-3R = 500µS (X1)
w/ 5000µS (X10) & (X100) 50mS additional ranges.
Example #2 - Resistivity: 753II-11-3R = 20MΩ (X1) w/ 2MΩ
(X.1) & 200KΩ (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.
Specifications
NONE
2. INSTALLATION
Briefly -
The 3RO must be installed/mounted by user outside of the
Monitor/controller housing by drilling a hole in user panel. For
the 3RE, a cutout the size of the enclosure is required.
On a Conductivity Monitor/controller the Range Module is
removed from Monitor/controller CB and re-installed on the 3R
Switch Module. On a Resistivity Monitor/controller the Range
Module is removed from Monitor/controller CB and a special 3
Range-Range Module is installed on the 3R Switch Module.
A cable harness from the 3R Module is connected to the main
Monitor/controller circuit board in place of the Range Module.
A separate small connector & harness is for the alarm/control
disable or kill, and attaches to the small 2 pin male connector lo-
cated to the left of the 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
3RO Module only - A suitable location must be found that is both
convenient to the user and allow sufficient clearance for the 3
Range Switch Module to clear obstructions.
3RE - 3 Range 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 Range Switch Module to be mounted.
2. Install label, aligning on the drilled hole.
3. Mount the 3 Range Switch Module to the panel with
hardware supplied.
4. Remove the Range Module from the Main
Monitor/controller CB.
5. For Conductivity models, re-install Range Module on to
the 3 Range Switch Module in the LEFT location.
For Resistivity models, install replacement SPECIAL 3
Range-Range Module, part number RM3R, on to the
3 Range Switch Module in the LEFT location. In both
cases the arrow must be pointing toward the spot.
6. Attach cable harness from the 3 Range Switch Module
to the main Monitor/controller CB in the place of the
Range Module removed in step 4, as shown in
figure III.G.1.
7. Attach the separate 2 wire cable harness from the 3
Range Switch Module to the 2 pin male connector S3
located to the left of the sensor input connectors on
the main CB, as shown in figure III.G.1. NOT
INSTALLED ON MONITOR ONLY MODELS.
3. ALARM/CONTROL CONFIGURATION
As shipped from the factory, the 3R Module is configured so that
only the Primary or First switch position X1 is set to alarm/
control, as shown in figure III.G.2. If your particular applica-
tion requirements are different, the following will help you to
reconfigure the alarm/control function to another range or add a
controlling range. Pick the appropriate scenario below.
NOTE: the setpoints will not change nor are they separately
adjustable for each range.
If adding an alarm/control range.
1. Locate the 8 position select switch on the 3SR Module.
2. Set appropriate select switch UP or ON, i.e. to add
X100, set switch marked X100 UP or ON, see
figure III.G.3.
If changing alarm/control from one range to another, i.e. X1 to
X10 Range.
1. Locate the 8 position select switch on the 3SR Module.
2. Set the X1 select switch in the DOWN or OFF position.
3. Set the X10 select switch in the UP or ON position, see
figure III.G.4.
To disable either COND/TDS or Resistivity alarm/control func-
tion completely.
1. Locate the 8 position select switch on the 3SR Module.
2. Set all X prefixed type select switches in the DOWN or
OFF position, see figure III.G.5.
To reconfigure Conductivity to Resistivity or vise versa.
If you have a Resistivity Monitor/controller and ordered a
!
CAUTION - READ FOLLOWING CAREFULLY