Display operation is verified. (During memory check the display contains four dashes.) The following
sequence is displayed for visual verification at approximately half-second intervals:
Each option slot and the input conditioner slot is checked frequently during a program cycle to verify
that no board has been inserted in a wrong slot. Failure of this check causes H004 to be displayed and
restarts the program.
If reading the display switch results in an unpermitted code, the message H005 is displayed, and the
program is restarted.
During every program cycle the input conditioner board identification code is read. If the ROM does
not contain the program corresponding to the identification, H006 is displayed. If the code differs from
that which was read during initialization, H003 is displayed. In both cases the program is restarted.
INPUT CONDITIONER BOARD Fig. 12
The input conditioner board accepts the analog signals from the Chlorine sensor and temperature compensator
and pH sensor and maintains the sensor polarization voltage during a power failure, by incorporating a
DUAL ALARM BOARD (Optional) Fig. 13
This board provides two independent alarm setpoints, each with an isolated form C relay contact rated at 10
Amps/250 VAC/24 VDC. If it is required to switch more than 3 Amps it is recommended that a power relay be
interposed. Connection to these contacts is made by means of terminal blocks on the input connector board.
ISOLATED CURRENT OUTPUT BOARD (Optional) Fig. 14
The isolated current output board provides a 0-20 mADC or 4-20 mADC current signal to drive loads up to 1000
ohms such as recorders, controllers, etc.
SERIAL INPUT/OUTPUT BOARD (Optional)