ARI Armaturen CONA control EN - Manual (Page 5)

Rev. 0040807014 1614 Page 2-5
Operating and Installation Instructions
CONA
®
-control
4.2 Operating principle
The test chambers, which resemble a syphon, are installed either directly in front of or on
the steam trap. If the steam trap is leaking steam, the condensate level on the input side is
forced downwards by the steam pressure.
If the steam trap is blocked, condensate collects upstream of it. The accumulated
condensate and the condensate in the test chamber cool down.
The level and temperature in the test chamber are measured by a calorimetric sensor and
evaluated by a measuring amplifier. The measuring amplifier must be mounted a maximum
of 2 m away from the sensor / test chamber to prevent disturbances from falsifying the
measurement result. In the standard version the cable of the measuring amplifier is 1 m
long.
If a fault is detected, it is indicated by means of LEDs on the measuring amplifier and the
central status indication (optional):
- "Steam Leakage" is indicated if the sensor is surrounded by steam.
- "Blockage" is indicated if the temperature in the test chamber is below the specified value.
The measuring amplifier can optionally be equiped with an relay card. so the data can be
evaluated and processed over the existing relay outputs e.g. in a SPS.
Also optionally, the measuring amplifier can be equipped with an AS-i bus card. A two-wire
cable can then be used to exchange data and supply the required power to the amplifier.
NOTE !
- When the plant or part of the plant is started up or shut down, "Blockage" is
indicated at least. The condensate or steam in the test chamber cools down so
that the temperature falls below the specified value.
- Depending on the plant operating conditions or the type of steam trap, it is
possible that the test chamber may no longer contain any condensate after the
plant has been shut down (due to evaporation, for example, or because the
steam trap has opened). In this case, "Steam Leakage" is also indicated.
- Status indications are triggered as a result!
- If the central status indication is used, all indicated faults should be reset after
the plant or part of the plant has been shut down!
Tip:
We recommend connecting the CONA
®
-control system to the plant control, so
that the plant control evaluates all fault indications and sets the "Trap Inspect"
LEDs. This permits faults that are indicated when parts of the plant are started up
or shut down to be reliably suppressed. The PLC software in the AS-i master /
gateway must be stopped for this purpose.
i