BAPI ZPM Standard Accuracy Pressure Sensor Instruction Manual

BAPI ZPM Standard Accuracy Pressure Sensor

Identification and Overview

BAPI’s ZPM is designed for quick and easy field installation. The outputs, ranges, units, directionality, are all easily set in the field without powering the unit.

The optional LCD display helps with troubleshooting because it displays the actual pressure regardless of the selected pressure range. Three LEDs on the face of the unit indicate when the pressure is “Out of Range Low”, “In Range” or “Out of Range High” for the selected range. The appropriate LED will flash when out of range.

Fig. 1: ZPM BAPI-Box Unit and Associated Parts.

Switch Setup – Outputs, Ranges, Units/Response

NOTE! Always follow the Auto-Zero procedure after changing settings.

Fig 2: Setup Switches for Low Range Units.

Mounting

Attach the unit to its mounting surface with the four self-tapping #10×3/4” sheet metal screws through the holes in the mounting feet. The preferred mounting orientation is with the pressure ports facing down to prevent condensation from entering the pressure transducer. Do not mount to a vibrating surface as vibration may cause issues with the accuracy of the sensing element. See page 3 for an actual size mounting template for the unit.

Fig. 3: ZPM BAPI-Box Mounting (for units without Attached Tube option).

The two cover latch screws must be installed to achieve an IP66 rating.

After Auto-Zeroing, remove the deadhead tubing and push the system tubing onto the port nipple without creating any kinks or holes.

If a hole must be cut into the plastic plugs in the ½” NPSM threaded ports of the BAPI-Box enclosure, it’s recommended to use BAPI’s Clean-Cut Tool. Not using this tool could cause damage to the electronics of the sensor. See the Accessories section of BAPI’s website or product catalog for more info on the Clean-Cut Tool.

Fig. 4: ZPM BAPI-Box Mounting (for units with Attached Tube option).

Fig. 5: Cover Latch Screws.

Mounting Template

Fig. 6: Mounting Hole Template – shown actual size (BAPI recommends creating 5/32” (4mm) pilot holes for the #10×3/4” self-tapping mounting screws.)

Output Termination

 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

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.

Table 1: ZPMB Termination

Output Signal| PWR Terminal| GND Terminal| V OUT Terminal
4 to 20 mA| 13 to 40 VDC| 4 to 20 mA Signal To Controller Analog Input| Not Used
0 to 5 VDC| 7 to 40 VDC or 18 to 28 VAC| To Controller Ground| VDC Signal To Controller Analog Input
0 to 10 VDC| 13 to 40 VDC or 18 to 28 VAC| To Controller Ground| VDC Signal To Controller Analog Input

Fig. 7: Wiring Terminals

Auto-Zero Procedure and Status LED Operation

AUTO-ZERO FOR STANDARD UNITS (See Fig. 8)
Auto-Zeroing must be done after the initial setup, changing mounting orientation or changing any settings. For most
applications, perform an auto-zero whenever it appears that the sensor has drifted. For critical applications, the unit
should be zeroed 2-3 times a year.

1. Power must be on.
2. Detach system tubing and deadhead ports using the supplied tubing or other short length of tubing. Do not kink tubing.
3. Press and hold the Auto-Zero button for 1-2 seconds. The Status LED will stop flashing when completed.
4. Remove deadhead tubing and reattach system tubing.
   Fig 8: Auto-Zero and Status LEDs
   

AUTO-ZERO FOR UNITS W/ ATTACHED TUBE (See Fig. 9)

1. Power must be on.
2. Disconnect the system tubing from the Low Port brass fitting and attach the supplied 6” deadhead tubing to the brass fitting.
3. Disconnect the clear internal tubing from the Center High Port fitting with your fingers (Fig. 9). A pliers may cut the tubing.
4. Connect the clear internal tubing to the supplied straight black fitting, and connect the 6” deadhead tubing to the other side of the fitting (Fig. 9).
5. Press and hold the Auto-Zero button for 1-2 seconds. The Status LED will stop flashing when completed.
6. Disconnect the deadhead tubing and reattach the clear internal tubing and system tubing. Confirm that the clear tubing is pressed all of the way onto the fitting and that it is not kinked.
   Fig 9: Deadheading ports on units with attached tube (-AT)
   

STATUS LED OPERATION

LED Off: No power is applied or the unit is in 4 to 20 mA Mode LED Solid (On): LED is on when power is applied and a VDC 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 Flashing: Auto-Zero. The LED will flash for about 20 seconds.

Typical Applications

Fig. 10: Duct Static Pressure Monitoring (ZPM Pressure Sensor mounted on the duct with a Static Pressure Probe in the duct.).

NOTE: Best practice is to form a drip loop in the tubing to prevent condensation from reaching the unit.

Fig. 11: Air Filter Pressure Drop Monitoring (ZPM Pressure Sensor mounted on the duct with a Static Pressure Probe on either side of the filter in a duct.)

Diagnostics

POSSIBLE PROBLEMS:
Status LED does not light.

Status LED is flashing

Output stuck (high or low)

Output not tracking pressure properly

POSSIBLE SOLUTIONS:

• Check power connections for proper power.
• Sensor is set to 4 to 20mA output.
• The unit is performing an auto-zero. Wait 20 seconds and check again.
• 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.

Specifications

Power:
13 to 40 VDC (4 to 20 mA Output)
7 to 40 VDC or 18 to 28 VAC (0 to 5 VDC Output)
13 to 40 VDC or 18 to 28 VAC (0 to 10 VDC Output)

Power Consumption:
20 mA max, DC only at 4 to 20 mA Output
7 mA max DC at 0 to 5 or 0 to 10 VDC Output
0.58 VA max AC at 0 to 5 or 0 to 10 VDC Output

Load Resistance:
4 to 20 mA Output 550 Ω Maximum @ 24 VDC
0 to 5 or 0 to 10 VDC Output 6KΩ Minimum

System Accuracy:
±1.0% FS, 32 to 104°F (0 to 40°C)
±0.1” WC (±24.9 Pa)

Temp Hysteresis & Stability: ±1% FS per year

Overpressure: Proof 300” WC (74.65 kPa)
Media: Clean, dry, non-corrosive gases
Compensated Temperature Range: 32 to 122°F (0 to 50°C)
Environmental Operating Range: -4 to 140°F (-20 to 60°C)
Storage Temperature: -40 to 185°F (-40 to 85°C)
Humidity: 0 to 95% RH, non-condensing
Wiring:
2 wires (4 to 20mA Current loop)
3 wires (AC or DC powered, VDC output)
Port Size: 1/4” barb
Enclosure Material:
UV-resistant Polycarbonate, UL94, V-0
Enclosure Rating: IP66, NEMA 4
Agency: UL, RoHS

Selectable Standard Ranges

Inches WC Pascals
0 to 1.00. ……………………….. 0 to 250
0 to 2.00 ………………………… 0 to 300
0 to 2.50 ………………………… 0 to 500
0 to 3.00 ……………………… 0 to 1,000
0 to 5.00 ……………………… 0 to 1,250
-1.00 to 1.00 ……………… -250 to 250
-2.00 to 2.00 ……………… -300 to 300
-2.50 to 2.50 ……………… -500 to 500
-3.00 to 3.00 ………… -1,000 to 1,000
-5.00 to 5.00 ………… -1,250 to 1,250

Specifications subject to change without notice.

Customer Support

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

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