Myron L 729II - Manual (Page 20)

G. RE-CONFIGURE YOUR MONITOR/CONTROLLER
(Configuration Module Installation)
1. DESCRIPTION
The 720 Series II Monitor/controllers have been designed for
easy field re-configurability. The Configuration Module consists of
a 16 pin Header that plugs into a 16 pin socket.
NOTE: Changing from pH to ORP or visa versa, requires a
different sensor.
pH Module — pH14
ORP Module — ORP2A ANALOG Module†
ORP Module — ORP2D DIGITAL Module†
NOTE: Some OEM models may not be re-configured being
originally manufactured with fixed resistors. If your application
requires re-configuring an OEM model, first contact the system
manufacture for help. The Myron L Company may re-configure or
exchange your instrument at a cost.
2. INSTALLATION
Briefly -
The new Configuration Module simply replaces the Configuration
Module presently installed, see figure II.G.1.
Type label will be required if changing from pH to ORP or visa
versa.
ZERO and SPAN recalibration is performed.
IMPORTANT NOTES:
1. CHANGING FROM pH TO ORP OR VISA VERSA
WILL REQUIRE A SCALE CHANGE ON ANALOG
MODELS. SEE SECTION II.G.4 FOR INSTRUCTIONS.
† 2. ANALOG and DIGITAL ORP MODELS REQUIRE
DIFFERENT CONFIGURATION MODULES. SEE
FIGURES II.G.8 AND II.G.9.
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
NOTE: When opening instrument, remove front cover with care;
a ribbon cable connects the front panel and main board. If the
front panel has all ready been removed from the enclosure skip to
#4.
1. Using a standard slot screwdriver remove the
screws on the front panel.
2. Carefully wiggle the front panel to loosen the gasket and
pull gently toward you. Do not pull more than about 8
inches/20CM or you could damage the wiring harness.
3. Turn the front panel around so that the back side is
facing you and set aside.
4. Locate and remove existing Configuration Module from
MAIN Circuit Board, as shown in figure II.G.1. It is not
easy to remove, it was designed to stay in place under
adverse conditions.
5. With the pointer up, carefully align the new configuration
Module to the socket on the MAIN Circuit Board as shown
in figure II.G.1.
6. Press firmly into place.
7. Analog models will require the meter scale to be changed.
See Changing Analog Meter Scale, section II.G.3.
8. Recalibrate, see CALIBRATION PROCEDURES, V.C.
16
!
CAUTION - READ FOLLOWING CAREFULLY
Figure II.G.1
REMOVE TO
INSTALL
FUSE*
115/
230
TRANSFORMER
Main CB Assembly
721 726
722 727
723 728
724 729
MYRON L
COMPANY
CONFIGURATION
MODULE
UP
}
3S
INC
DEC
SPC SPAN ZERO
HYS1 SP1
SPAN
ZERO
POINTER
DO NOT
ADJUST
0-10VDC
OUTPUT
7 pH/ZERO mV
PUSH TO TEST
DIS
ORP ZERO
SPAN (GAIN )
PUSH TO TEST
BK WT RD GN NU R- R+
PWR C GD NC NO CM
PA
RA
GN
D
CH
S
REMOVE T
O INST
ALL
SECOND RELA
Y
pH
}
SP
AN
DE
C