The BAPI BA/ZPM-SR-ST-ND is a field-configurable Zone Pressure Multi-Sensor (ZPM) in BAPI’s standard IP44/NEMA 2 enclosure. This is the Standard Range model with ten field-selectable pressure ranges up to ±2.5” WC (five unidirectional and five bidirectional, switchable via DIP switch) and five field-selectable output signals (4 to 20 mA, 0 to 5 VDC, 0 to 10 VDC, 2 to 10 VDC, or 1 to 5 VDC). Output, range, units (inches WC or Pascals), directionality, and response time are all set via DIP switches without powering the unit. A NIST-traceable calibration certificate is included at no extra charge. This configuration ships with a static pressure probe included in the package — ready to install without a separate probe order and features a 3-color LED status indicator (Out of Range Low / In Range / Out of Range High) for at-a-glance line-of-sight pressure status.
10 Field-Selectable Ranges
DIP switches select between ten standard range pressure ranges up to ±2.5” WC. SW1 toggles bidirectional or unidirectional operation, doubling the effective range choices from a single unit. No re-ordering or re-stocking when the application changes.
Five Output Signals — One SKU
DIP-switch selectable: 4 to 20 mA, 0 to 5 VDC, 0 to 10 VDC, 2 to 10 VDC, or 1 to 5 VDC. All five outputs are native — no multiplexing. Power 7–40 VDC for 4-20 mA; 7–40 VDC or 18–32 VAC for VDC outputs.
Static Probe Included + LED Status
Ships with a static pressure probe in the package for immediate installation. Three face-mounted LEDs provide at-a-glance pressure status without BAS access. NIST-traceable calibration certificate included at no extra charge.
Full Specifications
| BA/ZPM-SR-ST-ND Zone Pressure Multi-Sensor | |
|---|---|
| Manufacturer | Building Automation Products, Inc. (BAPI) |
| Series | ZPM – Zone Pressure Multi-Sensor |
| Part Number | BA/ZPM-SR-ST-ND |
| Sensor Type | Piezoresistive differential, dry media only |
| Pressure Range | ±2.5” WC max (5 bi + 5 unidirectional) |
| Field-Selectable Ranges | 10 |
| Accuracy | ±0.25% FS at 77°F (25°C) • ±0.025” WC (±6.22 Pa) |
| Total Error Band | ±0.5% FS or ±0.05” WC (±12.44 Pa) |
| Output Signals | 4-20 mA / 0-5 VDC / 0-10 VDC / 2-10 VDC / 1-5 VDC (DIP-switch selectable) |
| Power Supply | 7 to 40 VDC (4-20 mA); 7 to 40 VDC or 18 to 32 VAC (0-5 / 1-5 VDC); 13 to 40 VDC or 18 to 32 VAC (0-10 / 2-10 VDC) |
| Power Consumption | 20 mA max DC (4-20 mA) • 5.2 mA max DC (VDC outputs) • 0.12 VA max AC (VDC outputs) |
| Load Resistance | 4-20 mA: 850Ω max @ 24 VDC • VDC: 6 kΩ min |
| Display / Indication | 3-color LED: Out of Range Low / In Range / Out of Range High |
| Zero Adjust | Push-button auto-zero on front panel |
| Range Setting | DIP-switch selectable without power |
| Probe Option | Static pressure probe included in package (not pre-attached) |
| Enclosure Material | UV-resistant Polycarbonate, UL94 V-0 |
| Enclosure Rating | IP44, NEMA 2 |
| Enclosure Dimensions | 4.51 x 3.63 x 2.22” (115 x 92 x 57 mm) L x W x H |
| Pressure Port | 1/4” barb (6.3 mm) |
| Wiring | 2-wire (4-20 mA loop) or 3-wire (VDC outputs) |
| Operating Temperature | −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 |
| Overpressure | Proof 300” WC (74 kPa) |
| Agency | CE EN 61326-1:2013 EMC (Industrial), UL, RoHS |
| NIST Certificate | Included at no extra charge |
| Warranty | 5 Years |
Field-Selectable Ranges
Both direction and range are DIP-switch selectable for Standard Range units. Any range below can be paired with any of the five output signals.
| # | Bidirectional | Unidirectional |
|---|---|---|
| 1 | -1.00 to 1.00” WC | 0 to 1.00” WC |
| 2 | -2.00 to 2.00” WC | 0 to 2.00” WC |
| 3 | -2.50 to 2.50” WC | 0 to 2.50” WC |
| 4 | -3.00 to 3.00” WC | 0 to 3.00” WC |
| 5 | -5.00 to 5.00” WC | 0 to 5.00” WC |
Frequently Asked Questions
What is the accuracy of the BAPI ZPM Standard Range?
±0.25% of full scale at 77°F (25°C), equivalent to ±0.025” WC (±6.22 Pa) for the Standard Range. Total Error Band (covering non-linearity, hysteresis, and thermal effect across the compensated range of 32 to 122°F) is ±0.5% FS or ±0.05” WC (±12.44 Pa). Long-term stability is ±0.25% FS per year. A NIST-traceable calibration certificate is included at no extra charge.
What output signals does the BA/ZPM-SR-ST-ND support?
Five outputs are DIP-switch selectable: 4 to 20 mA (2-wire loop), 0 to 5 VDC, 0 to 10 VDC, 2 to 10 VDC, and 1 to 5 VDC. All five are native outputs — not multiplexed. Power requirements differ by output: 7–40 VDC for 4-20 mA; 7–40 VDC or 18–32 VAC for 0-5 / 1-5 VDC; 13–40 VDC or 18–32 VAC for 0-10 / 2-10 VDC.
Can the Standard Range ZPM read negative (bidirectional) pressure?
Yes. A DIRECTION DIP switch toggles between unidirectional (0 to +range) and bidirectional (−range to +range), giving 10 effective range choices from this one part number. Bidirectional mode is ideal for building pressurization and room-to-room differential pressure where pressure can swing positive or negative relative to reference.
- Output Signal:
- 4-20 mA, 0-5 VDC, or 0-10 VDC
- Pressure Type:
- Differential
- Pressure Ranges:
- 0 to 5 Inch
- Media:
- Dry
- Accuracy:
- 0.25%
- LCD Display:
- 3-Color LED
- Zero Function:
- Yes
- Range Setting:
- Adjustable
- Communication:
- None
- Series:
- ZPM Series
