The BAPI ZPS-05-LR57-EZ-ST-D is a factory-configured EZ Pressure Sensor with a fixed 0 to 5 VDC output and fixed −0.25 to +0.25” WC bidirectional pressure range (range code LR57). Unlike the field-selectable EZ variants, the output and pressure range are factory-set, simplifying commissioning to an auto-zero only. Direction (uni- or bidirectional) and units (inches WC or Pascals) remain field-adjustable via the rotary switch and NEXT button. Ships with a static pressure tube included. The LCD display shows live pressure over the full operational range. Mounts on DIN rail, 2.75” Snaptrack, or surface via the adjustable blue tabs. A NIST-traceable calibration certificate is available at no extra charge.
Factory-Set 0-5V / −0.25 to +0.25” WC
Output and pressure range are set at the factory. No rotary-switch output or range adjustment required in the field — simply auto-zero after mounting and connect wires. Bidirectional/unidirectional and WC/Pascal units remain field-selectable.
LCD Display + Auto-Zero
The onboard LCD displays live differential pressure over the full operational range regardless of which range is selected, making commissioning and troubleshooting faster. Auto-zero via the front-panel NEXT button — connect the high and low ports together, set the rotary to 0, and press NEXT. Display shows progress bars then “donE”.
Static Tube + Panel Mount
Static pressure tube ships in the package, ready to connect to your pressure tap. Blue mounting tabs extend for DIN rail or surface mount, or push in for 2.75” Snaptrack. About 1/3 the size of field-mount pressure sensors — fits tight panel spaces. Pluggable terminal block accepts 14–24 AWG wire.
Full Specifications
| ZPS-05-LR57-EZ-ST-D EZ Pressure Sensor | |
|---|---|
| Manufacturer | Building Automation Products, Inc. (BAPI) |
| Series | EZ Pressure Sensor — Factory Configured |
| Part Number | ZPS-05-LR57-EZ-ST-D |
| Range Code | LR57 — −0.25 to +0.25” WC bidirectional |
| Output (Fixed) | 0 to 5 VDC |
| Pressure Range (Fixed) | −0.25 to +0.25” WC bidirectional |
| Accuracy | ±0.25% FS at 77°F (25°C) • ±0.005” WC (±1.24 Pa) |
| Total Error Band | ±1.25% FS or ±0.025” WC (±6.22 Pa) |
| Temp Hysteresis & Stability | ±0.35% at 77°F (25°C) for 1,000 hours |
| Field-Selectable | Direction (uni/bidirectional) and units (in WC / Pascals) |
| Power | 7 to 40 VDC or 6 to 28 VAC |
| Power Consumption | 4.9 mA max DC • 0.12 VA max AC |
| Load Resistance | 6 kΩ minimum |
| Display | LCD — live pressure over full operational range |
| Probe / Tube | Static pressure tube included |
| Overpressure | Proof 270” WC (67 kPa) |
| Pressure Port | 3/16” barb (4.75 mm) |
| Wiring | Removable/pluggable terminal block, 14–24 AWG; 3-wire (VDC) |
| Mounting | DIN Rail, 2.75” Snaptrack, or Surface |
| Enclosure | ABS Plastic, UL94 V-0 • 1.94 x 1.89 x 3.35” (49.2 x 48 x 85 mm) |
| Operating Temperature | 14 to 131°F (−10 to 55°C) |
| Storage Temperature | −4 to 140°F (−20 to 60°C) |
| Humidity | 0 to 95% RH, non-condensing |
| Agency | RoHS, CE EN 61326-1:2013 EMC |
| NIST Certificate | Available at no extra charge |
| Warranty | 5 Years |
Frequently Asked Questions
What does the range code LR57 mean on ZPS-05-LR57-EZ-ST-D?
LR57 is a BAPI factory range code specifying the bidirectional Low Range of −0.25 to +0.25” WC (−50 to +50 Pascals). This range and the 0-5V output are factory-set and cannot be changed in the field. Direction (uni/bidirectional) and units (in WC or Pascals) remain field-selectable via the rotary switch.
How do I auto-zero the ZPS-05-LR57-EZ-ST-D?
Connect the high and low pressure ports together with a short length of tubing (no kinks). Set the rotary switch to the 0 position — the display shows Aut0. Press and hold the NEXT button; the display shows progress bars then donE for about 4 seconds. Return the rotary switch to the desired pressure range position. For critical applications, perform an auto-zero 2–3 times per year.
What is the power requirement for ZPS-05-LR57-EZ-ST-D?
The 0-5V output requires 7 to 40 VDC or 6 to 28 VAC. For 0 to 10 VDC or 2 to 10 VDC outputs (on field-selectable variants), the minimum is 12 VDC or 9 VAC. Power consumption is 4.9 mA max DC or 0.12 VA max AC at VDC output settings.
- Output Signal:
- 0-5VDC
- Pressure Type:
- Differential
- Pressure Ranges:
- 0 to 3 Inch
- Media:
- Dry
- Accuracy:
- 1.0%
- LCD Display:
- 5-Color LED
- Zero Function:
- Yes
- Range Setting:
- Fixed
- Communication:
- None
- Series:
- FRP Series
