BAPI Delta Style Installation And Operating Instructions

Installation and Operating Instructions

Delta Style Room Humidity Transmitter with Optional Temp. Sensor 

BA/#-Hxxx-R

Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI  54631 USA

Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com

Specifications subject to change without notice.

27417_ins_Delta_RH

1 of 4

rev. 04/15/14

LOCATION: Avoid mounting on outside walls or in direct sunlight.

JUNCTION BOX (J-Box), (Fig. 3)

  1.  Pull the wire through the wall and out of the junction box, leaving about 

six inches free.

  2.  Pull the wire through the hole in the base plate.

  3.  Stuff insulation into box behind the sensor plate and screw the plate 

firmly to the J-box. 

  4.  Secure the back plate to the box using the #6-32 x 5/8 inch mounting 

screws provided.  

  5.  Terminate the unit according to the guidelines in the Termination section.

  6. Attach cover by latching it to the top of the base, rotating the cover down 

and snapping it into place.

  7.  Secure the cover by backing out the lock-down screws using a 1/16” 

Allen wrench until it is flush with the bottom of the cover.

DRYWALL MOUNTING (Similar to Fig. 3 but without the J-Box)

  1.  Place the base plate against the wall where you want to mount the 

sensor and mark the two mounting holes and the area where the wires 

will come through the wall.

  2.  Drill two 3/16” holes in the center of each marked mounting hole. Insert a 

drywall anchor into each hole.

  3.  Drill one 1/2” hole in the middle of the marked wiring through hole area.

  4.  Pull the wire through the wall and out the 1/2” hole, leaving about six inches free.

  5.  Pull the wire through the hole in the base plate.

  6.  Stuff insulation into the wall behind the sensor plate and screw the plate firmly to the wall anchors.

  7.  Secure the base to the drywall anchors using the #6 x 1” mounting screws provided.

  8.  Terminate the unit according to the guidelines in the Termination section.

  9.  Attach cover by latching it to the top of the base, rotating the cover down and snapping it into place.

10.  Secure the cover by backing out the lock-down screws using a 1/16” Allen wrench until it is flush with the sides of the 

cover.

Note: In any wall-mount application, the wall temperature and the temperature of the air within the wall cavity can cause 

erroneous readings. The mixing of room air and air from within the wall cavity can lead to condensation, erroneous 

readings and sensor failure. To prevent these conditions, BAPI recommends sealing the conduit leading to the 

junction box with fiberglass insulation. 

The Delta Style room humidity transmitter 

measures relative humidity (RH) and outputs a 

0 to 100% RH on either a 4 to 20mA, 0 to 5V or 

0 to 10V signal.  It can be ordered with optional 

temperature sensor and LCD display.  The unit is 

powered by a wide selection of AC or DC power 

depending on the signal selection.  The optional 

LCD display can selectively show RH and/or 

temperature values.  The optional temperature 

sensor can use any 2-wire passive sensor.

 Overview and Indentification

Fig. 1: Delta Style Room 

Humidity Transmitter without 

Display

Fig. 2: Delta Style Room 

Humidity Transmitter with 

Display

Fig. 3: Delta Style Unit Installation. 

Mounting hardware is provided for both 

junction box and drywall installation 

(junction box installation shown).

Mounting