The BAPI ZPM (Zone Pressure Multi-Sensor) is a field-configurable differential pressure transmitter that replaces five or more fixed-range sensors on your truck or shelf. A single BA/ZPM-HR-NT-ND-BB covers 5 pressure ranges up to 30_ WC and three selectable output signals, so one SKU spans most common high-range HVAC and building-pressurization applications. Because it targets one-way duct pressures, HR boards are unidirectional only Ñ the DIRECTION switch on SR/LR boards is disabled.
This variant ships in the BAPI-Box (IP66/NEMA 4) enclosure with the 3-color led status and no probe. Every range, output, and zero-point is set with DIP switches and a front-panel zero button Ñ no software, no handheld, no service trip needed if the application changes.
Field-Configurable
5 pressure ranges, 3 output signals (4-20 mA, 0-5 VDC, 0-10 VDC), and push-button zero Ñ all DIP-switch selectable without opening a laptop.
3-Color LED Status
Tri-color LED status indicator (green=OK, yellow=configuration, red=fault); no display. Ideal for budget-conscious installs where a simple at-a-glance status indicator is enough.
No Probe Ñ Source Your Own
No probe included. Pair with any BAPI ZPS pickup port or your existing tubing:
Full Specifications
| Manufacturer | Building Automation Products, Inc. (BAPI) |
| Series | ZPM Ð Zone Pressure Multi-Sensor |
| Part Number / MPN | BA/ZPM-HR-NT-ND-BB |
| Sensor Type | Piezoresistive differential, dry media only |
| Pressure Range | 30_ WC max (unidirectional only) |
| Field-Selectable Ranges | 5 |
| Accuracy | ±0.25% of full scale (combined linearity, hysteresis, repeatability) |
| Output Signals | 4-20 mA (2-wire) / 0-5 VDC / 0-10 VDC (field-selectable) |
| Display / Indication | Tri-color LED status indicator (green=OK, yellow=configuration, red=fault); no display |
| Zero Adjust | Push-button auto-zero on front panel |
| Range Setting | DIP-switch selectable in the field |
| Direction Setting | Unidirectional only (DIRECTION switch disabled on HR) |
| Probe Option | No probe Ñ customer supplies pickup port or tubing |
| Enclosure | BAPI-Box Ð impact-resistant polycarbonate, IP66 / NEMA 4 rated |
| Enclosure Color | Light gray |
| Mounting | Wall or duct surface mount via integrated mounting tabs |
| Electrical Connection | Screw terminals, 12-24 AWG |
| Power Supply | 12 to 40 VDC or 24 VAC ±10% |
| Power Consumption | < 0.5 W typical |
| Pressure Connections | 1/8_ barbed fittings (high & low ports) |
| Media Compatibility | Clean dry air or non-conductive, non-corrosive gas |
| Operating Temperature | _20¡ to 140¡F (_29¡ to 60¡C) |
| Storage Temperature | _40¡ to 185¡F (_40¡ to 85¡C) |
| Humidity | 0 to 95% RH, non-condensing |
| Burst Pressure | 10 PSI (max over-pressure) |
| Long-Term Stability | < ±1% F.S. per year |
| Response Time | < 100 ms (adjustable damping) |
| Compliance | RoHS, CE |
| Weight | Approx. 0.9 lb / 0.41 kg |
| Country of Origin | U.S.A. |
| Warranty | 5 years, manufacturer defects |
Field-Selectable Ranges
Note: High Range (HR) boards are unidirectional only. The DIRECTION switch present on SR and LR boards is disabled on HR; all 5 selectable ranges read positive pressure only.
| # | Unidirectional Range |
|---|---|
| 1 | 0 Ð 5_ WC |
| 2 | 0 Ð 10_ WC |
| 3 | 0 Ð 15_ WC |
| 4 | 0 Ð 25_ WC |
| 5 | 0 Ð 30_ WC |
Frequently Asked Questions
What is the accuracy of the BAPI ZPM HR?
±0.25% of full scale (combined linearity, hysteresis, and repeatability) at reference conditions, with long-term stability under ±1% F.S. per year.
What output signals does the BA/ZPM-HR-NT-ND-BB support?
4-20 mA (2-wire loop), 0-5 VDC, and 0-10 VDC. The signal is selected on a DIP switch inside the cover Ñ all three are native, not multiplexed.
Can the HR variant read negative pressure?
No. High Range boards are unidirectional only Ñ the DIRECTION switch present on SR and LR boards is disabled on HR. If you need bidirectional high-range sensing, use two HR units plumbed in opposite directions, or step down to an SR variant.
How do I change the range or output signal in the field?
Remove the cover, locate the DIP-switch bank on the main board, and set the range and output per the label silkscreened inside the enclosure. A push-button zero on the front panel re-zeros the sensor for the new range. No firmware, handheld, or tooling required.
How does the 3-color LED status work?
Green indicates normal operation with a valid signal, yellow indicates configuration mode (DIP switch changed, needs re-zero), and red indicates a fault (out-of-range input, wiring issue, or sensor failure).
What pickup port or probe should I pair with this NT variant?
Most zone and duct applications use a BAPI ZPS-ACC20 low-profile pickup port (room side) with a ZPS-ACC04 or ZPS-ACC04-60 room pickup (reference side). For in-duct static, pair with a ZPS-ACC01 static probe in the appropriate length, or a ZPS-ACC05 wall plate pickup. See the chip grid above for the full BAPI ZPS family, or pair with any existing 1/8_ ID tubing you already stock.
What's the enclosure rating?
BAPI-Box: IP66 / NEMA 4 rated impact-resistant polycarbonate. Suitable for dusty, washdown-adjacent, or humid mechanical rooms. Not rated for hazardous locations.
Is this covered by warranty, and how long?
Yes Ñ 5-year manufacturer's warranty against defects in materials and workmanship, one of the longest in the BAS differential-pressure category. Register the product with BAPI and keep your invoice for warranty claims.
Technical Documents
- Output Signal:
- 4-20 mA, 0-5 VDC, or 0-10 VDC
- Pressure Type:
- Differential
- Pressure Ranges:
- 0 to 30 Inch
- Media:
- Dry
- Accuracy:
- 0.25%
- LCD Display:
- 3-Color LED
- Zero Function:
- Yes
- Range Setting:
- Adjustable
- Communication:
- None
- Series:
- ZPM Series
