3)Display operation is verified. (During memory check the display contains four dashes.) The followingsequence is displayed for visual verification at approximately half-second intervals:0000111122223333444455556666777788889999----EEEEHHHHPPPP(BLANK)4)Each option slot and the input conditioner slot is checked frequently during a program cycle to verifythat no board has been inserted in a wrong slot. Failure of this check causes H004 to be displayed andrestarts the program.5)If reading the display switch results in an unpermitted code, the message H005 is displayed, and theprogram is restarted.6)During every program cycle the input conditioner board identification code is read. If the ROM doesnot contain the program corresponding to the identification, H006 is displayed. If the code differs fromthat which was read during initialization, H003 is displayed. In both cases the program is restarted.INPUTCONDITIONERBOARD Fig. 12The input conditioner board accepts the analog signals from the Chlorine sensor and temperature compensatorand pH sensor and maintains the sensor polarization voltage during a power failure, by incorporating arechargeable battery.DUALALARMBOARD (Optional) Fig. 13This board provides two independent alarm setpoints, each with an isolated form C relay contact rated at 10Amps/250 VAC/24 VDC. If it is required to switch more than 3 Amps it is recommended that a power relay beinterposed. Connection to these contacts is made by means of terminal blocks on the input connector board.ISOLATEDCURRENTOUTPUTBOARD (Optional) Fig. 14The isolated current output board provides a 0-20 mADC or 4-20 mADC current signal to drive loads up to 1000ohms such as recorders, controllers, etc.SERIALINPUT/OUTPUTBOARD (Optional)Consult factory.13
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