Installation
NAR300 system for high temperature
32
Hauser
5.4
Adjustment
5.4.1
Verification of detection sensitivity in actual liquid
Verification of detection sensitivity when the lower layer is water and the upper layer
is oil
If the electrode tip is pulled out of the lower-layer water due to increased thickness of the
oil layer, water may cling onto the electrode tip like an icicle even if the electrode tip is in
oil. In this case, detection sensitivity may increase by 1 to 2 mm. When an accurate
detection check is required, apply a small amount of neutral detergent to the electrode tip
to keep water from clinging to the electrode.
Verification of the oil layer thickness in a transparent container
Exercise caution as a reading error may occur due to the liquid's surface tension, liquid
adhesion to the container wall, and for other reasons.
5.4.2
Alarm output adjustment
The only adjustment that can be made on the transmitter is the delayed activation time
(ON delay) setting for the alarm output relay. Time is set on the delay trimmer. In
NRR261, the delay trimmer can be found by turning off the power and opening the main
unit's cover. In NRR262, the delay trimmer is found on the case surface. Match the setting
to the necessary delay time in units of seconds. Delayed activation is used to prevent a
false alarm by recognizing an alarm condition that continues over a certain period of time
as an alarm while not outputting an alarm when the alarm condition stops within the
delay time setting. This can be set to 30 seconds for the TIIS specification, and up to a
maximum of 15 seconds for all other specifications.
• A response delay time in the detection circuit of approximately 6 seconds is always
added to the delay time of the delay trimmer.
• Open the NRR261 main unit cover after the power has been turned off for at least
10 minutes.
1
1
2
3
3
A0039891
20
Alarm output relay
1
Delay trimmer
2
Cover
3
LED power (green) / Alarm (red)
