Header Tank Automatic Fill Relay

Model: HTAF

 

 

    Model: HTAF

    

 

  *  SMART OPERATION

   * AUTOMATIC FUEL PUMP TURN ON and SHUTOFF

   * EASY INSTALLATION

   * FOUR PUMP TIMES (SELECTABLE)

   * OPERATE WITH OR WITHOUT A FUEL SENSOR

   * NEW DESIGN MINIMIZES WIRING

   *  RELIABLE OPTICAL FUEL SENSOR (OPTIONAL)

   * PUMP-UP COMPLETED SIGNAL

   * SLOSHING FUEL WILL NOT AFFECT OPERATION

 

 

 

DESCRIPTION

The HTAF 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 HTAF will pump up the header tank for a short time period, then automatically shut the fuel pump off. The HTAF is normally used with a very reliable optical fuel level sensor (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, the HTAF can be set up so the pilot may manually activate the timed pumping.

 

The HTAF can be operated in one of four pre-programmed pumping times. 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. 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, the HTAF can be set up so the pilot may manually activate the HTAF. This can be accomplished with a normally open switch (NO) connected between terminals 2 and 11. Pressing this switch simulates a low fuel condition starting the HTAF. This switch can be installed on the instrument panel. (NOTE: because the HTAF was designed for a fuel sensor, and it utilizes fuel slosh damping, the user may have to press this switch for several seconds before the pumping starts.

 

SELECTING A PUMPING TIME

The HTAF can be operated in one of the four possible pre-programmed pumping times. Select one of these time periods below and wire the HTAF according to the manual diagram.


   1 MINUTE Pump Time

   PUMPTIME0, HTAF Terminal 3, Connect to battery common.

   PUMPTIME1, HTAF Terminal 4, Connect to battery common.


   2 MINUTE Pump Time

   PUMPTIME 0, HTAF Terminal 3, No connection (OPEN)

   PUMPTIME 1, HTAF Terminal 4, Connect to battery common.


   3 MINUTE Pump Time

   PUMPTIME 0, HTAF Terminal 3, Connect to battery common.

   PUMPTIME 1, HTAF Terminal 4, No connection (OPEN)


   4 MINUTE Pump Time

   PUMPTIME 0, HTAF Terminal 3, No connection (OPEN)

   PUMPTIME 1, HTAF Terminal 4, No connection (OPEN)

 

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: HTAF      (includes sensor)

               HTAF-ns (without sensor)

 

Click here to download HTAF Spec. Sheet

 

Click here for the HTAF Manual

 

FEATURES:

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               Ohio Residents will pay 7.5% tax.

 

Header Tank Automatic Fill Fuel Pump Relay,  HTAF  (with Fuel Sensor)   $129.00

Price below is total price with shipping.

 

PLEASE select SHIPPING OPTIONS before adding to CART.

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

Price below is total price with shipping.

 

PLEASE select SHIPPING OPTIONS before adding to CART.