BAPI Low Range ZPM Owner's manual

Low Range ZPM - Zone Pressure Sensor
Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel:[phone] • Fax[phone] • E-mail:[email protected] • Web:www.bapihvac.com
Specications subject to change without notice.
1 of 4
Installation & Operations
38926_ins_ZPM_LR rev. 04/09/20
Identication and Overview
Switch Setup - Outputs, Ranges, Units/Response
Fig 2: Setup
Switches for
Low Range
Units
1. Select OUTPUT
2. Select RANGE
If unit is ordered with a Custom Range,
then the switch must be set to R6.
3. Choose DIRECTION
Bidirectional is a plus/minus range so
choosing 0.5” range is -0.5” to +0.5”
Bidirectional and 0” to +0.5” Unidirectional
4. Choose UNITS - Inches WC or PASCALS
5. Choose RESPONSE TIME
Fast Response = 1/2 second
Slow Response = 4 seconds
Do not have power applied to unit when changing settings. After changing settings, apply power and Auto-Zero
the unit in its orientation of operation.
6. Mount, Terminate and Auto-Zero the unit
as described in later sections. Attach
the deadhead tubing to the ports during
Auto-Zeroing
BAPI’s ZPM is designed for quick
and easy eld installation. The
outputs, ranges, units, directionality,
and response time are quickly set in
the eld with no tools, no power and
no small components.
The optional LCD display helps with
troubleshooting because it displays
the actual differential pressure
over the entire operational range
regardless of which pressure range
is selected for output to the system
controller. Three LEDs on the
face of the unit indicate when the
pressure is “Out of Range Low”, “In
Range” or “Out of Range High”. Fig. 1: ZPM unit and
associated parts
Bulkhead tting
for static tube
Static tube
and hose
with surge
damper
(for units
ordered with
the included
Static Tube.)
Cover latch
screw
Conduit
foam plug
Static tube
screws
Mounting
screws
Deadhead
tubing

Low Range ZPM - Zone Pressure Sensor
Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel:[phone] • Fax[phone] • E-mail:[email protected] • Web:www.bapihvac.com
Specications subject to change without notice.
2 of 4
Installation & Operations
38926_ins_ZPM_LR rev. 04/09/20
Mounting
Fig. 6:
Mounting Hole
Template - shown
actual size
(BAPI recommends
creating 5/32” pilot
holes for the #10x3/4”
self-tapping mounting
screws.)
Center
hole is only
needed for
the Attached
Tube (-AT)
version of the
ZPM unit
Attach the unit to its mounting surface
with four self-tapping #10x3/4” sheet
metal screws through the holes in the
mounting feet. The preferred mounting
orientation is with the pressure ports
facing down.
Remove the deadhead tubing and push
the system tubing onto the port nipple
without creating any kinks or holes.
Fig. 3: ZPM Mounting
(for units without Attached
Tube option)
Fig. 5: Cover
Latch Screw
Fig. 4: ZPM Mounting
(for units with Attached
Tube option)
A locking screw can
be inserted into the
hole in the cover
latch to prevent
unintentional cover
openings.

Low Range ZPM - Zone Pressure Sensor
Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel:[phone] • Fax[phone] • E-mail:[email protected] • Web:www.bapihvac.com
Specications subject to change without notice.
3 of 4
Installation & Operations
38926_ins_ZPM_LR rev. 04/09/20
LED Off: No power is applied or the unit is in 4 to 20 mA Mode
LED On: LED is on when power is applied and voltage output is selected.
When 4 to 20 mA output is selected, the light is on for 2 seconds at power up
then goes off.
LED Blinking Fast: Auto-Zero or Error Mode
LED Blinking Slow: The pressure measurement is above or below the
selected pressure range. Note: When the reading is above or below the
selected pressure range, the LCD on the face of the unit will alternate between
showing the actual reading and showing “err”.
Output Termination
Status LED Operation
Fig 7:
Status LED on the
inside of the cover
Auto-Zeroing must be done after the initial setup and after any changing of
settings.
1. Make sure power is applied
2. Deadhead ports
4. Press the Auto-Zero button for 2 seconds (LED blinks)
5. Remove deadhead after LED stops blinking
6. Attach system tubing
Auto-Zero Operation
Fig 6:
Auto-Zero
Button
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 void the warranty.
PWR
Terminal
GND/4-20
Terminal
Vout
Terminal
Fig. 7: ZPM Wiring Terminals
To ensure that all wires are properly terminated, twist the stripped ends of each
wire together before inserting into the terminals. Gently tug on the wire after
inserting into the terminal to verify a good connection.
Output Signal PWR Terminal GND/4-20 Terminal Vout Terminal
4 to 20 mA 7 to 40 VDC 4 to 20 mA Signal To
Controller Analog Input Not Used
0 to 5 or 1 to 5 VDC 7 to 40 VDC
or 18 to 32 VAC To Controller Ground VDC Signal To Controller Analog Input
0 to 10 or 2 to 10 VDC 13 to 40 VDC
or 18 to 32 VAC To Controller Ground VDC Signal To Controller Analog Input
Table 1: ZPM Termination

Low Range ZPM - Zone Pressure Sensor
Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel:[phone] • Fax[phone] • E-mail:[email protected] • Web:www.bapihvac.com
Specications subject to change without notice.
4 of 4
Installation & Operations
38926_ins_ZPM_LR rev. 04/09/20
Selectable Low Ranges
Inches WC Pascals
0 to 0.10................................0 to 30
0 to 0.25................................0 to 50
0 to 0.50..............................0 to 100
0 to 0.75..............................0 to 175
0 to 1.00..............................0 to 250
-0.10 to 0.10 ......................-30 to 30
-0.25 to 0.25 ......................-50 to 50
-0.50 to 0.50 ..................-100 to 100
-0.75 to 0.75 ..................-175 to 175
-1.00 to 1.00 ..................-250 to 250
Power:
7 to 40 VDC
for 4 to 20 mA Output
7 to 40 VDC or 18 to 32 VAC
for 0 to 5 or 1 to 5 V Output
13 to 40 VDC or 18 to 32 VAC
for 0 to 10 or 2 to 10 V Output
Port Size:
1/4” tubing (1/8” to 3/16” I.D.)
Specications
Troubleshooting
POSSIBLE PROBLEMS:
LED does not light
LED is blinking fast
(1/2 second on, 1/2 second off)
Display is alternating between a
number and “err”
Output stuck (high or low)
Output not tracking pressure properly
POSSIBLE SOLUTIONS:
- Check power connections for proper power
- The unit may be performing an auto-zero. Wait 10 seconds and check again.
- Sensor is in an Error Mode. Cycle power.
- The measurement is out of selected range.
- Remove pressure from ports and perform auto-zero procedure
- Check rotary switch for proper pressure range selection
- Check rotary switch for proper output range selection
Typical Applications
NOTE: Best practice is to form a drip loop in the tubing to prevent condensation from reaching the ZPM.
Fig. 8: Duct Static Pressure Monitoring
(ZPM Pressure Sensor mounted on the duct
with a Static Pressure Probe in the duct.)
Fig. 9: Air Filter Pressure Drop Monitoring
(ZPM Pressure Sensor mounted on the
duct with a Static Pressure Probe on either
side of the lter in a duct.)