Emerson 2468CB, 2468CD manual 2-20, 2.5.2DISPLAY BOARD, 2 - Number of electrodes being displayed

2468CB & 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual

2.5.2DISPLAY BOARD 24680515

The Display Board needs to know how many electrodes are being used and if one or two input boards are being used. A centrally mounted dual-in-line switch assembly, SW1 (titled “Number of Electrodes”) uses four individual switch channels to select between an 8 and 32 electrode operation as shown in Table 2.2 below. A socket LK1 (situated near switch SW1) is provided to link the two halves of the display board together with a link header when only one input board is used. In this case when two input boards are being used, the link header is not fitted.

Sockets are also provided at LK2, LK3, LK4 and LK5 locations (see Figure 2.5), to select an 8 - 16 (two LEDs per electrode) display mode or an 18 - 32 (one LED per electrode) display mode. For hazardous area applications, links 2, 3, 4 and 5, when fitted, must be secured into the sockets using a cable tie passed underneath the socket base.

	SWITCH SW1			NO. OF ELECTRODES		LINKS 2-5
	CHANNEL NO.			IN WATER	PER INPUT	LINKS	LINKS
1	2	3	4	COLUMN	BOARD	2 & 4	3 & 5
Off	Off	On	On	8	4
On	On	Off	On	10	5	Fitted	Not
Off	On	Off	On	12	6		Fitted
On	Off	Off	On	14	7
Off	Off	Off	On	16	8
On	On	On	Off	18	9
Off	On	On	Off	20	10
On	Off	On	Off	22	11
Off	Off	On	Off	24	12	Not	Fitted
On	On	Off	Off	26	13	Fitted
Off	On	Off	Off	28	14
On	Off	Off	Off	30	15
Off	Off	Off	Off	32	16

Table 2.2 - Number of electrodes being displayed

2.5.2.1Link LK1 Setting

Ensure that link header LK1 is not fitted (see Figure 2.5).

2.5.2.2Configuring the ‘Number of Electrodes’ Switch

WARNING Mains voltages are present in this instrument when power is connected. De-energise before opening front cover.

1.Disconnect the power supply. Gain access to PCB 24680515 by opening the cover.

2.Locate position of ‘Number of Electrodes’ switch SW1 see Figure 2.5.

3.Depending upon the number of electrodes being used, set the switches as defined in Table 2.2. The switch positions in the example shown are for a twelve electrode system.

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