BAPI BAPI-Stat 4 Dew Point Sensor Catalog Page
BAPI-Stat 4 Dew Point Sensor
Installation & Operating Instructions
24596_ins_B4_Rm_Dew_Pt rev. 07/01/15
Overview
BAPI’s Dew Point Sensor is an easy and economical way to measure
the dew point temperature. The unit is available with an optional
LCD display, temperature setpoint slider and an occupant override
pushbutton.
The large format display allows you to easily read Dew Point
Temperature and Dry Bulb Temperature. The display alternates
between these values and is eld adjustable between °F or °C. One
or both of the displayed values may be easily turned on or off by an
HVAC technician.
Figure 1:
BAPI-Stat 4
Dew Point
Mounting
Mounting hardware is provided for both junction box and drywall installation (junction box installation shown).
Junction Box
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. Secure the plate to the box using the #6-32 x 1/2 inch mounting screws
provided.
4. Terminate the unit according to the guidelines in the Termination
section.
5. Attach Cover by latching it to the top of the base, rotating the cover
down and snapping it into place.
6. Secure the cover by backing out the lock-down screws using a 1/16”
Allen wrench until they are ush with the bottom of the cover.
Drywall Mounting
1. Place the base plate against the wall where you want to mount the
sensor.
2. Using a pencil mark out the two mounting holes and the area where the wires will come through the wall.
3. Drill two 3/16” holes in the center of each marked mounting hole. Insert a drywall anchor into each hole.
4. Drill one 1/2” hole in the middle of the marked wiring area.
5. Pull the wire through the wall and out of the 1/2” hole, leaving about six inches free.
6. Pull the wire through the hole in the base plate.
7. Secure the base to the drywall anchors using the #6 x 1 inch 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. Secure the
cover by backing out the lock-down screws using a 1/16” Allen wrench until they are ush with the bottom of the
cover.
Fig 2: Mounting to a Junction Box
NOTE: In any wall-mount application, the wall temperature and the temperature of the air within thewall 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. BAPI recommends sealing the conduit leading to the junction box, lling the
junction box with berglass insulation or sealing the wall cavity.
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BAPI-Stat 4 Dew Point Sensor
Installation & Operating Instructions
24596_ins_B4_Rm_Dew_Pt
Terminations
BAPI recommends using twisted pair of at least 22 AWG. Larger gauge wire may be required for long runs. All wiring must
comply with the National Electric Code (NEC) and local codes. Do NOT run this device’s wiring in the same conduit as
AC power wiring of NEC class 1, NEC class 2, NEC class 3 or with wiring used to supply highly inductive loads such as
motors, contactors and relays. BAPI’s tests show that uctuating and inaccurate signal levels are possible when AC power
wiring is present in the same conduit as the signal lines.
BAPI recommends wiring the product with power disconnected. Proper supply voltage, polarity, and wiring
connections are important to a successful installation. Not observing these recommendations may damage the
product and will void the warranty.
0 TO 5 VDC OR 0 TO 10 VDC TERMINATION
Terminal Function
OVR1 & OVR2
....Override Output (Dry Contact Switch).
OVR2 is internally connected to SET2 & SEN2.
SET1 & SET2 ..... Setpoint output.
SET2 is internally connected to OVR2 & SEN2.
SEN1 & SEN2 ....Sensor Output (Resistive Output).
SEN2 is internally connected to OVR2 & SET2.
(Semiconductor SEN1=+,SEN2=-)
rev. 07/01/15
Fig 3: Circuit Board
Optional Test Balance Switch
Optional Test and Balance Switch (SW2)
LOW: Sets the sensor value to LOW
NORM: The sensor will operate normally
HI: Sets the sensor value to the HIGH
EXT-OVR
............Allows remote control of the LCD indicaor for
occupancy, and is activated by logic LOW or
power supply ground at this terminal.
..................Dew Point Signal [to analog input of controller]
VOUT
....................... Power, 15 to 35VDC (No AC power)
V+
....................To controller power supply ground [GND or
GND
Common]
Note 1: OVR2, SEN2 and SET2 are connected together internally.
Note 2: The termination screws on the circuit board should be
turned fully Counter Clockwise (CCW) to open the jaws fully. Then
insert the eld wire and turn the screws Clock Wise (CW) to pinch
the wire fully closed. If the jaws are left partially open, the inserted
wire may be on bottom of, instead of inside, the jaws causing a
poor connection.
Low Temp (40° F) High Temp (105° F)
Sensor Type Resistance Value Resistance Value
1000Ω RTD 1.02KΩ (41.2°F) 1.15KΩ (101.5°F)
3000Ω Thermistor 7.87KΩ (39.5°F) 1.5KΩ (106.8°F)
10K-2 Thermistor 30.1KΩ (39.2°F) 4.75KΩ (105.8°F)
10K-3 Thermistor 26.7KΩ (35.9°F) 5.11KΩ (108.4°F)
10K-3(11K) Thermistor 7.32KΩ (43.7°F) 3.65KΩ (105.2°F)
Specications subject to change without notice.
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