Header Tank Automatic Fill Relay

Model: HTAF2

 

 

    Model: HTAF2

    

   *  SMART OPERATION

   * AUTOMATIC FUEL PUMP TURN ON and SHUTOFF

   * EASY INSTALLATION

   * USER SELECTABLE PUMP TIMES (0-10 MINUTES)

   * OPERATE MANUALLY OR WITH ONE OR TWO FUEL SENSORS

   * NEW DESIGN MINIMIZES WIRING

   * RELIABLE OPTICAL FUEL SENSOR (OPTIONAL)

   * PUMP-UP COMPLETED SIGNAL

   * SLOSHING FUEL WILL NOT AFFECT OPERATION

   * MALFUNCTION WARNING INDICATION

 

 

DESCRIPTION

The HTAF2 is a “Smart” Header Tank Pump Relay. This device automatically keeps the aircraft header tank full without over stressing your fuel pump. A low fuel sensor can be easily mounted in the header tank. When low fuel is detected in the Header Fuel Tank, the HTAF2 will pump up the header tank for a short time period, then automatically shut the fuel pump off. The HTAF2 is normally used with one or two very reliable optical fuel level sensors (optional) that can be easily installed in the header fuel tank. If the user is not able to install a fuel sensor in the header fuel tank, or a sight tube area, the HTAF2 can be set up so the pilot may manually activate the timed pumping.

 

The HTAF2 pumping time is user selectable from zero to ten minutes.  The unit also has a relay output that can be used for a light to indicate when the fuel in the header tank is low.  The low fuel relay output is damped so that it does not falsely indicate low fuel in the case of sloshing fuel.  This same relay output is used for a malfunction alarm.  If you connect a light or LED to the relay output, you can see any such malfunction in the cockpit.

 

The HTAF2 was designed for a fuel sensor inputs.  It utilizes a fuel slosh damping technique to eliminate fuel level detection malfunctions.  The system can be powered by +12V or +24V electrical systems.

 

Model: HTAF vs HTAF2

HTAF

Operation:

  Manually or One Sensor Operation (Header Tank Low Fuel)

Pumping Period:

  4 selectable pumping periods

 

HTAF2

Operation:

  Manually or One Sensor Operation (Header Tank Low Fuel) or Two Sensors Operation (Header Tank, Low Fuel and Fuel Full)

Pumping period:

  Selectable from 0 to 10minutes

 

ELECTRONICS ENCLOSURE INSTALLATION

The electronics enclosure was designed to mount almost anywhere. Mounting it near the sensor or fuel pump eliminates the need for running long wires.  Keep the enclosure away from extremely high temperatures, areas of excessive vibration or where fuel may be spilled.

 

IF YOU CANNOT INSTALL A FUEL SENSOR IN THE HEADER TANK

If the user is not able to install a fuel sensor in the header fuel tank, or is not able to install it in a fuel sight tube area, the HTAF2 can be set up so the pilot may manually activate the HTAF2. This can be accomplished with a normally open push button switch (NO) mounted in the cockpit. Pressing this switch simulates a low fuel condition starting the HTAF2.  The pump will start and pump for a time period selected by the user.

 

SELECTING A PUMPING TIME PERIOD

The user can select a pumping time period from 0 to 10 minutes.

 

USE of OTHER FUEL LEVEL SENSORS

Can you use other fuel level sensors? 

YES, if they are compatible with our sensor output.  The output should be an "open collector" or a TTL (0 to +5V) type output.  The output must be high in air, low in fuel.  Please read below for 0 to 3.3V outputs.

 

Can you use a Pillar Point Fuel Sensor?

Well, maybe.  The Pillar Point sensor has an output that is an open collector output (BLU wire), but it is not compatible because it has the opposite output response.  The only output that is compatible, is the 0 to +3.3V output (WHT wire).  We have tested it and it does work.  This output is compatible with the APFR and the HTAF.  On the HTAF2, only the "Start Sensor" input will work.  You cannot use the Pillar Point sensor for the "Finish Sensor" input on the HTAF2.  Please email us and ask, . . we are working on a version of the HTAF2 that will work with opposite polarity output sensors.

 

SPECIFICATIONS:

Input Power: 12Vdc or 24Vdc, 0.1A max.

Enclosure: 3.5" x 2.25 x 1.25" (89mm x 57 x 32mm )

Fuel Sensor Mounting Hole: 0.475" (12mm)  (Sensor threads 12mm x 1.0 pitch)

Weight: 3.0oz. (93g), 3.3oz. (103g) with sensor

Pump & Pump-Down Outputs: 8A max.  (Output can be used to drive another high current relay for higher powered pumps.)

Models: HTAF2-1   (includes one sensor)

               HTAF2-2   (includes two sensors)

               HTAF2-ns (without sensor)

 

Click here to download HTAF2 Spec. Sheet

 

Click here for the HTAF2 Manual

 

FEATURES:

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               Ohio Residents will pay 7.5% tax.

 

 

Header Tank Automatic Fill Fuel Pump Relay (no Sensor),  HTAF2-ns  (no Sensor)   $79.00

Price below is total price with shipping.

Header Tank Automatic Fill Fuel Pump Relay (with One Sensor),  HTAF2-1  (no Sensor)   $129.00

Price below is total price with shipping.

Header Tank Automatic Fill Fuel Pump Relay (with Two Sensor),  HTAF2-2  (no Sensor)   $169.00

Price below is total price with shipping.