AKO 5761H012 Gas Detector User Guide

AKO 5761H012 Gas Detector

Product Description

The Gas Detector is a device designed to detect gas leaks and provide an alarm in case of gas concentration exceeding the pre-set threshold levels. It has a gas sensor, display, and keypad for operation. It can detect various gases such as R-717 (NH3/ammonia), R-134a, R-22, R-404A, R-407A, R-407C, R-407F, R-409A, R-408A, R-410A, R-422A, R-422D, R-424A, R-434A, R-442A, R-448A, R-449A, R-450A, R-452A, R-453A, R-507A, R-513A, and R-744 (CO2).

Warnings

• The device should be installed and operated by qualified personnel only. Read the user manual carefully before operating the device.

Wiring
The device has two connection points labeled as DIG.IN A and B. The wiring diagram is provided in the user manual for proper installation.

Operation
The device has different modes of operation:

• Constant: Gas pre-alarm activated.
• Quick flashing: Gas alarm activated.
• Slow flashing: Gas alarm saved.
• Quick-flashing, 3 short beeps every 2 minutes: Sensor error.
• Constant: Set Hold mode activated.
• Flashing: Maintenance mode activated.

Keypad Operations
The device has the following keypad operations:

• Remote and Mute: Audible alarm silenced or disabled.
• Set Hold: Pressing for 3 seconds activates or deactivates Set Hold mode.
• Maintenance mode: Pressing for 6 seconds activates or deactivates maintenance mode.
• Second set of Pre-alarm/Alarm levels: Pressing both keys for 6 seconds activates or deactivates the second set of Pre-alarm/Alarm levels.

Detector Initialization
Each time the device is supplied with power, an initialization process begins. During this process, Gas pre-alarms and alarms are disabled for 1 hour for maintenance tasks. The alarms, digital inputs, and keyboard are disabled. After a few moments, the device begins to operate normally. However, at least 5 minutes should elapse for optimal operation to be reached. To activate/deactivate this mode, press the key for 6 seconds. The indicator will flash.

AUTO-CONFIGURATION Function
The AUTO-CONFIGURATION function is available only in independent operation. Optionally, the device can be returned to its factory settings by pressing the AUTO-CONFIGURATION push-button 5 times before step 4.

Pre-Alarm and Alarm Levels
The device has default Pre-alarm and Alarm levels, which can be adjusted according to the gas being detected. It also has a second set of Pre- alarm/Alarm levels that can be activated or deactivated by pressing both keys for 6 seconds.

Pre-Alarm Jumper
The Pre-alarm jumper allows for Pre-alarm detection to be enabled/disabled. Before using this option, ensure that regulations allow for two alarm levels.

Operation Check (Bump Test)
When using the ammoniac (AKO-57613) or CO2 (AKO-57615) detector, the pre-alarm must be enabled.

Warnings

• Detectors should be installed in a place protected from vibrations, water and corrosive gases, where the ambient temperature does not exceed the value indicated in the technical data.
• Detectors are not suitable for areas classified as potentially explosive.
• Detectors supervise a point and not an area. If the gas leak does not reach the sensor, or the level of concentration in that point does not reach the foreseen values according to the type of gas no alarm will be activated. If perimeter supervision is required, several sensors should be installed around that area.

Working conditions

• Avoid handling refrigerant gases near the sensor. If this is unavoidable, use Set Hold or Maintenance mode.
• Keep the detector work environment free of chemical agents (solvents, acetone vapours, paints, alcohol, cleaning products, silicone and derivatives, ethylene, etc.).
• Avoid installing the detector near products or devices that might give off CO2. (AKO-57615 only)
• Human breathing near the detector may increase the level of CO2. and generate false alarms. ( AKO-57615 only)
• Do not paint the detector or place it near solvents or paints. (AKO-57613/4 only)
• The sensor should be installed away from:
  • Areas where fermentation and ripening processes of products (bread, pizza, fruit, etc.) may occur. (AKO-57613/4 only)
  • Smoke outlets located in confined spaces or from engines, generators or motorized machinery (fork-lift trucks, etc.).
  • Particularly damp areas or with strong ventilation.
• The detector should usually be installed in an area where gas may concentrate, near to places where gas leaks could start.
• The detector’s location will depend on the refrigerant and will be in areas where gas leaks could concentrate. Taking into account individuals’ safety and their use of space, the lowest position of this space will be considered for refrigerants heavier than air (HCFC, HFC and CO2) and the highest possible position will be considered for refrigerants lighter than air (NH3).

Wiring

Connection to alarm station

Independent operation

Always disconnect the power supply to do the wiring.
The wiring between the detector/transmitter and the station should NEVER be installed in a conduit together with power, control or supply cables.
Cables for wiring the relay contact should have an adequate section depending on the unit to be connected.
Certain international standards maintain that the power supply of the alarm should originate from a different circuit to that used by the refrigeration and ventilation system. Please ensure that you comply with current local regulations.

Constant: Gas pre-alarm activated.
Quick flashing: Gas alarm activated.
Slow flashing: Gas alarm saved.
Quick-flashing, 3 short beeps every 2 minutes: Sensor error

• For gas Pre-alarm / Alarm, pressing briefly silences the alarm tone. During AUTO-CONFIGURATION, enable / disable the audible alarm.

• Pressing both keys for 6 seconds:

• Constant: Set Hold mode activated
  Flashing: Maintenance mode activated

• Audible alarm silenced or disabled (See AUTO-CONFIGURATION)

• Pressing for 3 seconds activates or deactivates Set Hold mode. Pressing for 6 seconds activates or deactivates maintenance mode.

• Second set of Pre-alarm / Alarm levels activated

• Powered via an external power supply (Independent operation)

Activation / deactivation of the second set of Pre-alarm / Alarm levels. Should there be a sensor error, restart the detector.

Detector initialization

Each time that the detector is supplied with power, an initialization process begins, during which the key flashes. During this process, the alarms, digital inputs and keyboard are disabled.
After a few moments, the detector begins to operate normally. However, at least 5 minutes should elapse for optimal operation to be reached.

AUTO-CONFIGURATION function (only in independent operation)

Allows for digital input polarity to be configured and for the audible alarm to be enabled / disabled.

1. Ensure that both digital inputs are in standby (not activated)
2. Disconnect the power supply, connect it again and press the ‘AUTO-CONFIGURATION’ push-button 5 consecutive times before 2 minutes have elapsed. The and indicators light up alternately.
3. Press the key to enable / disable the mute key.
4. Keep the “AUTO-CONFIGURATION” push-button pressed down for 5 seconds to save the configuration of the digital inputs.
   Optionally, we can return the detector to its factory settings. To do so, press the “AUTO-CONFIGURATION” push-button 5 times before step 4.

Pre-alarm jumper
Allows for Pre-alarm detection to be enabled / disabled. Before using this option, ensure that regulations allow for two alarm levels.

1. Pre-alarm enabled
2. Pre-alarm disabled

When using the ammoniac (AKO-57613) or CO2 (AKO-57615) detector, the pre-alarm must be enabled.

Pre-alarm and Alarm delay switch

Define the time elapsed between when the Pre-alarm / Alarm level is reached and the Pre-alarm / Alarm launches (Indicated on Display, audible alarm and relay activation).

Set Hold mode

Prevents false alarms when charging or cleaning the chambers.
While this mode is activated, pre-alarms will not signal and alarms will signal as pre-alarms when faced with all effects (sound, relay activation and signaling).
To activate/deactivate this mode, press the key for 3 seconds. The display will show the indicator.
You may also activate/deactivate this function remotely using digital input 2 (DI2) if required.
This mode will remain active for a maximum of 5 hours, then will deactivate automatically.
If this mode is activated using the key, it can only be deactivated using the same key. This is also true when activating the mode using digital input 2.

Maintenance mode

Disables gas pre-alarms and alarms for 1 hour for maintenance tasks. While this mode is activated, no gas pre-alarm or alarm will sound. To activate/deactivate this mode, press the key for 6 seconds. The indicator will flash.

Pre-alarm and Alarm levels

In the event of a sensor error, the detector emits 3 alert tones every 2 minutes,  the  icon flashes and the Pre the Alarm relay is activated.

We recommend using AKO-58110 cable. To carry out this check, follow the instructions included in the kit.

  Technical specifications

• Power supply………………………………………………………………………………………………………………………………………………………..12 – 30 Vdc
• Consumption Typical………………………………………………………………………………………………………………………………………………..75 mA
• Maximum………………………………………………………………………………………………………………………………………….125 mA
• Pre-Alarm/Alarm relay…………………………………………………………………………………………………………………….. SPDT 30 Vdc, 2 A, cos j =1
• Working ambient temperature AKO-57615…………………………………………………………………………………………………-40 ºC to 50 ºC
• Other models……………………………………………………………………………………………..-20 ºC to 50 ºC
• Storage ambient temperature…………………………………………………………………………………………………………………………….-30 ºC to 60 ºC
• Range of maximum moisture permitted………………………………………………………………………………….. 0 – 95 % HR (without condensation)
• Protection degree…………………………………………………………………………………………………………………………………………………………. IP 68
• Type of sensor AKO-57613 / 57614……………………………………………………………………………………………………………..Semiconductor
• AKO-57615 …………………………………………………………………………………… NDIR (Non-Dispersive Infrared Technology)
• Full scale AKO-57613 / 57614…………………………………………………………………………………………………………………………. 3000
• AKO-57615……………………………………………………………………………………………………………………………………. 10000
• Dimensions……………………………………………………………………………………………………………………….. 202 mm (W) x 82 (H) x 55.5 mm (D)

AKO ELECTROMECÁNICA , S.A.L.
Avda. Roquetes, 30-38
08812 • Sant Pere de Ribes.
Barcelona • Spain.
www.ako.com
We reserve the right to supply materials that might vary slightly to those described in our Technical Sheets. Updated information is available on our website.

References

• Industrial refrigeration: control and safety | AKO Group

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