The BAPI ZPS-20-LR52-EZ-NT is a Low Range EZ Pressure Sensor — a true differential pressure transmitter. BAPI's ordering guide specifies this part number for a 4 to 20 mA output over a 0 to 0.25″ WC unidirectional range (range code LR52). The EZ Pressure Sensor also provides front-panel procedures for field selection of output, pressure range, directionality and display units. The front-panel display reads live differential pressure across the full operational range. Supplied with no tube included.
Specifications on this page are taken from the BAPI EZ Pressure Sensor (ZPS) datasheet, Rev. 03/03/26, and the Low Range installation and operation instructions, rev. 06/08/2026. The agency listing (RoHS, UL, CE EN 61326-1:2013 EMC) is taken from the instruction sheets; the Rev. 03/03/26 datasheet lists RoHS and CE only.
Documented Applications
- Air filter pressure drop monitoring, with a static pressure probe on each side of the filter bank
- Duct static pressure monitoring, with a static pressure probe in the duct
- Zone pressure sensing — BAPI catalogs the EZ Pressure Sensor in its Zone Pressure Sensors (ZPS) family
- Panel installations where space is tight — BAPI states the unit is about one third the size of a field mount pressure sensor
BAPI illustrates air filter pressure drop and duct static pressure monitoring in the installation instructions. Confirm suitability for any other application against BAPI before specifying.
Key Features
Specified Range and Output
BAPI's ordering guide specifies this part number for a 4 to 20 mA output and a 0 to 0.25″ WC unidirectional range. The EZ Pressure Sensor also provides front-panel procedures for selecting output, pressure range, directionality and display units. BAPI's start-up sequence applies in full: 24 hours of acclimation with no pressure applied, then 60 minutes powered and deadheaded in the range of measure, then an auto-zero.
Display Reads Live Pressure
The front-panel display shows differential pressure across the entire operational range, which turns balancing and troubleshooting into a visual check instead of a meter reading at the controller.
Inches WC or Pascals
The UNIT position on the rotary switch toggles the display between inches of water column and Pascals.
Low Range Accuracy
±0.25% FS at 77°F (25°C) or ±0.005″ WC (±1.24 Pa), with a total error band of ±1.25% FS or ±0.025″ WC (±6.22 Pa) — typical accuracy within the compensated range of 32 to 122°F (0 to 50°C), after initial start-up and auto-zero.
Three Ways to Mount
Blue mounting tabs pull out for DIN rail or surface mounting and push in for 2.75″ Snaptrack. The unit is about one third the size of a field-mount pressure sensor, so it fits where panel space is tight.
NIST Traceable Certificate Available
BAPI offers a NIST traceable certificate for this sensor at no extra charge. BAPI's ordering guide lists no tube included with this part number — order the pickup separately if the application needs one.
Technical Specifications
| Specification | Value |
|---|---|
| Sensor Type | True differential pressure transmitter |
| Pressure Range | 0 to 0.25″ WC (Unidirectional, code LR52) |
| Range Class | Low Range model — supports ranges to -1 to +1″ WC (-250 to +250 Pascals) |
| Output Signal | 4 to 20 mA |
| Display Units | Inches WC or Pascals, field selectable |
| Power Supply | 8 to 40 VDC |
| Power Consumption | 20 mA max DC |
| Load Resistance | 850 ohm maximum @ 25 VDC |
| Wiring | 2 wires |
| Accuracy | ±0.25% FS at 77°F (25°C) or ±0.005″ WC (±1.24 Pa) |
| Total Error Band | ±1.25% FS or ±0.025″ WC (±6.22 Pa) — typical accuracy within the compensated range of 32 to 122°F (0 to 50°C), after initial start-up and auto-zero |
| Temperature Hysteresis & Stability | ±0.35% at 77°F (25°C) for 1000 hours |
| Overpressure | Proof 270″ WC (67 kPa) |
| Media | Clean, dry, non-corrosive gases |
| Pressure Ports | 3/16″ barb (4.75 mm) |
| Display | Integrated display, reads pressure over the entire operational range |
| Operating Environment | 14 to 131°F (-10 to 55°C), 0 to 95% RH, non-condensing |
| Storage Temperature | -4 to 140°F (-20 to 60°C) |
| Enclosure Material | ABS plastic, UL94 V-0 |
| Mounting | DIN rail, 2.75″ Snaptrack, or surface |
| Dimensions | 1.94″ (49.2 mm) W x 1.89″ (48 mm) D x 3.35″ (85 mm) H |
| Agency | RoHS, UL, CE EN 61326-1:2013 EMC |
| Calibration Certificate | NIST traceable certificate available at no charge |
| Included Accessories | No Tube Included |
| Warranty | 5 years |
Documentation
Specifications are subject to change without notice. Always confirm against the current BAPI datasheet before ordering.
Related Products
Companion unit supplied with the static pressure pickupBAPI ZPS-LR-EZ-NT-IN
Field-selectable version (set range and output on site)All Dry Differential Pressure Transmitters
Browse the full ZOT Supply range
Frequently Asked Questions
What is the pressure range and output of the ZPS-20-LR52-EZ-NT?
BAPI's ordering guide specifies this part number for a 4 to 20 mA output over a 0 to 0.25″ WC unidirectional range, range code LR52. It is a Low Range model, which BAPI lists as supporting ranges to -1 to +1 in WC (-250 to +250 Pascals). The EZ Pressure Sensor also provides front-panel procedures for field selection of output, pressure range, directionality and display units, documented in the installation and operation instructions.
How do I wire this unit?
Power the unit from 8 to 40 VDC. Connect the Gnd/4-20 mA Out terminal to a 4 to 20 mA input on the controller; the Voltage Out terminal is not used. BAPI recommends wiring with power disconnected. The terminal block is pluggable and uses rising block screw terminals — back the screws fully counterclockwise before inserting wire.
What is the start-up and auto-zero procedure?
Let the sensor acclimate for 24 hours with no pressure applied. Then power it, deadhead the ports and leave it in the desired range for 60 minutes. To auto-zero, tie the high and low ports together with a short unkinked tube, move the rotary switch to the 0 position (the display reads Aut0), press NEXT, and wait for donE. BAPI recommends re-zeroing 2 to 3 times a year on critical applications.
How accurate is the ZPS-20-LR52-EZ-NT?
Accuracy is ±0.25% FS at 77°F (25°C) or ±0.005″ WC (±1.24 Pa). The total error band, which covers non-linearity, hysteresis and thermal effect on span, is ±1.25% FS or ±0.025″ WC (±6.22 Pa) — typical accuracy within the compensated range of 32 to 122°F (0 to 50°C), after initial start-up and auto-zero.
Does a tube or probe come with this part number?
No. BAPI's ordering guide lists no tube included with this part number. The sensor ports are 3/16″ (4.75 mm) barbed fittings, and BAPI shows a static pressure probe (ZPS-ACC07) used in both the filter differential and duct static applications in the installation instructions. BAPI recommends forming a drip loop in the tubing so condensation cannot reach the sensor.
Where can this sensor be mounted?
DIN rail, 2.75″ Snaptrack, or directly to a surface or panel backplane. Pull the blue mounting tabs out for DIN rail and surface mounting, or push them in for Snaptrack. Surface mounting uses 1/8″ pilot holes and #8 flathead screws.
How much overpressure can it take?
Proof overpressure is 270 in WC (67 kPa) for this range class. Media must be clean, dry, non-corrosive gases.
Building Automation Products, Inc. shows a 5 year warranty for the EZ Pressure Sensor (ZPS) family on the product datasheet, Rev. 03/03/26. BAPI notes that improper supply voltage, polarity, or wiring connections may damage the product and void the warranty. Full warranty terms are set by BAPI. ZOT Supply is an authorized BAPI distributor and can assist with warranty claims and application support.
- Series:
- ZPS Series
- Pressure Range Class:
- Low (1 to 10 in WC)
- Pressure Range:
- 0 to 0.25 in WC
- Direction:
- Unidirectional
- Output Signal:
- 4-20 mA
- Display:
- Integrated
- Accuracy Class:
- High (0.5% FS or better)
- Mounting:
- DIN Rail
- Included:
- No Tube
- Made in USA:
- Unspecified
