Ysi DIQ/S 182 XT-4 System 182 XT-4 User Manual download pdf (Page 110)

Outputs System 182 XT-4

6 - 18

ba76026e01 01/2012

6.4.4 Limit indicator

Function The characteristic of the limit indicator is laid down in the Limit value

UL, Limit value LL, Hysteresis UL and Hysteresis LL settings. The

fundamentals of the function are described in the introductory chapter

(see section 6.3.2).

In order to set up the Limit indicator function for a relay output, the relay

output must be linked with a sensor (see section 6.2.1).

Settings

Setting Selection/Values Explanation

Limit values UL main variable

LL main variable

UL adjoining var.

LL adjoining var.

Main variable

designates the actual

measured parameter

of the sensor (e.g. pH,

oxygen, etc.).

Adjoining variable

designates an

additional measured

parameter (e.g.

temperature).

Limit value UL Within the measuring

range (sensor-

dependent)

Any upper or lower

limiting value

Limit value LL

Hysteresis UL 0 - 10 % of the

measuring range

Hysteresis for upper or

lower limiting value

Hysteresis LL

Behavior at error Open

Unchanged

The relay opens,

closes or remains

unchanged in the case

of system errors or

sensor errors (see

page 6-34).

Action Open

Relay action

Switching delay 0 ... 3600 s The time period for

which a limiting value

must be exceeded

before the relay

operates.

Prevents frequent

switching for

measured values that

are close to the limiting

value.

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 153 154

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Ysi DIQ/S 182 XT-4 System 182 XT-4 User Manual Page 110

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