YOKOGAWA WT210, Руководство пользователя, Страница: 145 / 316

9-9
IM 760401-01E
External In/Output Function
9
9.4 Comparator Function (Option)
When the instrument is equipped with option /CMP you can compare the measured,
computed, and integrated values with previously set limits and these results can be
output by contact relay.
Contact Relay Output
This instrument is equipped with four contact relays (4 ch) as follows. If the relay is not
operating, the NC (Normally Closed) contact is closed. If the relay is operating, the NC
contact is opened and the NO (Normally Open) contact is closed.
Relay specifications
• Contact rating: rated 24 V/0.5 A (max. 30 V/0.5 A)
• Minimum load: 10 mV/10
µ
A
• Operating life with load: approx. 500000 times (at contact rating)
• Operating life without load: approx. one hundred million times
• Contact Response time: 2 times the display update rate or less
Note
Since this relay is subject to wear, it is excluded from the 3-year warranty.
CAUTION
Damage to the relays may occur when a voltage or current exceeding the
specified range is applied to the contact output terminal.
Comparator Mode
The following two comparator modes are available.
Single Mode
If the measured, computed, and integrated values exceed the previously set limits, the
relay contact will become NO. This mode is useful when you want to assign each of
the four relays individually. Refer to the figure below.
Exceeding limit
⇒
closed status
NC
NO
ch 2
COM
24 V
When the current value is less than 3 A: NO-GO will be determined and the
circuit becomes open.
When the current value is 3 A or more: GO will be determined and the circuit
becomes closed.
Below limit
⇒
open status
NC
NO
ch 2
COM
24 V
Current
Time
3A
Limit of ch2 is set to 3 A
NO-GO determination area
Current
Time
3A
Limit of ch2 is set to 3 A
GO determination area