ARI-CONA Control AWH (PN40)

Monitoring system for steam traps / External test chamber

Description

Applications
The CONA®-control monitoring system is a test device for steam traps. A test chamber is installed either directly in front of or on the steam trap.
Steam leakage or blockage of the steam trap can be detected by means of a sensor.
Detected faults can optionally be grouped together and indicated centrally, for example in the control room.
Relay outputs or an AS-Interface are provided for data communication.
The AS-i master has an interface for higher-level bus systems, so that fault indications can also be directly evaluated by the plant controls.

All information provided here conforms to the Pressure Equipment Directive 2014/68/EU.
It is the responsibility of the plant planner to ensure compliance.
Special markings on the valve must be taken into account.
Refer to the data sheet to see which materials are used in standard versions.
Please contact the supplier or the manufacturer if you have any questions

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.

The central status indication integrates an AS-i power supply and an AS-i master / gateway.
It allows up to 30 steam traps to be centrally monitored. The AS-i master / gateway has a PROFIBUS interface as standard to enable all status indications to be evaluated by a higher-level control.
Faults that are indicated when the plant or part of the plant is started up or shut down can thus be reliably suppressed.
If the status indications are separately evaluated by the “central status indication”, the PLC software in the AS-i master is required.
The LEDs on the “central status indication” light up continuously to indicate the current status of each device.
If a fault is detected, it is stored and a “Trap Inspect” signal is sent to the corresponding measuring amplifier over the AS-i bus.
As soon as the steam trap functions correctly again after a fault has been cleared, the LED on the central status indication blinks to show that the fault is no longer present.
By pressing the Reset button on the central status indication, you can reset the stored fault.
“Trap Inspect” is indicated on the measuring amplifier by a yellow LED.
This permits a defective steam trap to be identified easily, even in the field.

Indications on the CONA®-control system

The LEDs on the “central status indication” light up continuously to indicate the existence of a fault.
As soon as the steam trap functions correctly again, the LEDs blink to show that the faults are no longer present.
By pressing the Reset button, you can reset a stored fault.

ARI-CONA Control Monitoring system for steam traps / External test chamber