The BAPI ZPS-20-FR53-BB-AT is a Fixed Range Pressure (FRP) differential pressure transmitter with a factory-set 4 to 20 mA output and a fixed 0 to 0.50” WC Unidirectional pressure range (range code FR53). Both the output and pressure range are locked at the factory, eliminating field configuration errors and reducing commissioning to a single auto-zero step. The rugged IP66/NEMA 4 polycarbonate enclosure with hinged cover mounts directly to any surface via four external tabs and #10 self-tapping screws. A three-color LED (Red/Green/Blue) provides instant pressure status without accessing the BAS. This configuration ships with an attached static pressure probe built into the enclosure, so a single trade can install the sensor and connect the high-pressure tap without a separate probe order. A NIST-traceable calibration certificate is available at no extra charge.
Fixed 4-20 mA / 0 to 0.50” WC
Output and range are factory-locked — commissioning is auto-zero only. Power: 7 to 40 VDC. Wiring: 2-wire (current loop) via rising-block terminal. Accuracy: ±1% FS + 0.003” WC (0.75 Pa). Stability: ±1% FS per year.
3-Color LED Status + IP66/NEMA 4
Three visible LEDs provide pressure status at a glance without opening the enclosure or accessing the BAS. Red = Out of Range High • Green = In Range • Blue = Out of Range Low. Hinged cover with latch screws achieves IP66 rating. UV-resistant polycarbonate enclosure rated NEMA 4.
Attached Static Probe
Static pressure probe is factory-attached inside the BAPI-Box enclosure. One trade installs the sensor and connects the pressure tap — no separate probe, tubing, or bulkhead fitting order. Mount with preferred orientation pressure ports facing down to prevent condensation. 4 external tabs, #10 × 3/4” self-tapping screws (included).
Full Specifications
| ZPS-20-FR53-BB-AT Fixed Range Pressure Sensor | |
|---|---|
| Manufacturer | Building Automation Products, Inc. (BAPI) |
| Part Number | ZPS-20-FR53-BB-AT |
| Range Code | FR53 — 0 to 0.50” WC Unidirectional |
| Output (Fixed) | 4 to 20 mA |
| Pressure Range (Fixed) | 0 to 0.50” WC Unidirectional |
| System Accuracy | ±1% FS + 0.003” WC (0.75 Pa), 32 to 104°F (0 to 40°C) |
| Temp Hysteresis & Stability | ±1% FS per year |
| Power | 7 to 40 VDC |
| Wiring | 2-wire (current loop) via rising-block screw terminal |
| Probe / Tube | Attached Static Pressure Probe |
| Overpressure | Proof 300” WC (74 kPa) |
| Pressure Port | 1/4” barb |
| Enclosure | UV-resistant Polycarbonate, UL94 V-0 • IP66, NEMA 4 with hinged cover |
| Dimensions | 4.11 x 2.50 x 5.49” (104.4 x 63.5 x 139.4 mm) W x D x H |
| Mounting | 4 external tabs, #10 x 3/4” self-tapping screws (ports-down preferred) |
| Compensated Temp Range | 32 to 104°F (0 to 40°C) |
| Operating Temp | −4 to 158°F (−20 to 70°C) |
| Storage Temp | −40 to 203°F (−40 to 95°C) |
| Humidity | 0 to 95% RH, non-condensing |
| Media | Clean, dry, non-corrosive gases |
| Agency | CE EN 61326-1:2013 EMC (Industrial EMC), RoHS |
| NIST Certificate | Available at no extra charge |
| Warranty | 5 Years |
3-Color LED Status Indicator
The LED is powered whenever supply voltage is applied. LED color indicates pressure state at a glance:
| LED Color | Pressure Status |
|---|---|
| Red | Out of Range High — pressure above upper limit |
| Green | In Range — pressure within span |
| Blue | Out of Range Low — pressure below lower limit |
Frequently Asked Questions
What pressure range does range code FR53 specify on this FRP sensor?
FR53 designates a factory-set pressure range of 0 to 0.50 in WC (unidirectional). Both this pressure range and the 4 to 20 mA output are locked at the factory and cannot be changed in the field. The NIST-traceable calibration certificate available at no extra charge covers this specific range and output combination.
How do I auto-zero the ZPS-20-FR53-BB-AT?
The unit must be mounted at its final location before auto-zeroing. Power must be on. Disconnect the system tubing from the Low Pressure brass fitting and attach the supplied 6-inch deadhead tubing. Disconnect the short clear tubing from the 90-degree black fitting using your fingers. Connect the clear tubing to the supplied straight black fitting on the deadhead tube. Do not kink the tubing. Press and hold the Auto-Zero button for 1 to 2 seconds; the LED stops flashing when complete. Reattach the clear tubing and system tubing, confirming the clear tubing is fully seated and not kinked.
What power supply does the 4-20 mA output on this FRP sensor require?
The 4 to 20 mA output requires 7 to 40 VDC. Wiring uses a 2-wire (current loop) rising-block screw terminal (V+, GND, VOUT). BAPI recommends wiring with power disconnected. Do not run sensor wiring in the same conduit as line voltage or highly inductive loads such as motors or generators.
