The BAPI ZPS-20-FR75-BB-NT is a Fixed Range Pressure (FRP) differential pressure transmitter with a factory-set 4 to 20 mA output and a fixed 0 to 5.00” WC Unidirectional pressure range (range code FR75). 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 includes no tube — connect your own 1/4” tubing to the barbed ports, or add a BA/ZPS-ACC07 static pressure probe assembly. A NIST-traceable calibration certificate is available at no extra charge.
Fixed 4-20 mA / 0 to 5.00” 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.
Field-Mount, No Tube
1/4” barbed ports accept standard pressure tubing. Mount with preferred orientation pressure ports facing down. 4 external tabs, #10 × 3/4” self-tapping screws (included). Add a BA/ZPS-ACC07 Static Pressure Probe Assembly (probe, rubber hose, surge damper, screws, bulkhead fitting) for complete duct tap installations.
Full Specifications
| ZPS-20-FR75-BB-NT Fixed Range Pressure Sensor | |
|---|---|
| Manufacturer | Building Automation Products, Inc. (BAPI) |
| Part Number | ZPS-20-FR75-BB-NT |
| Range Code | FR75 — 0 to 5.00” WC Unidirectional |
| Output (Fixed) | 4 to 20 mA |
| Pressure Range (Fixed) | 0 to 5.00” 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 | No Tube Included |
| 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 FR75 specify on this FRP sensor?
FR75 designates a factory-set pressure range of 0 to 5.00 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-FR75-BB-NT?
The unit must be mounted at its final location before auto-zeroing. Power must be on. Detach the system tubing and deadhead both ports using the supplied tubing or a short length of tubing — do not kink. Press and hold the Auto-Zero button for 1 to 2 seconds; the Status LED will stop flashing when complete. Remove the deadhead tubing and reattach the system tubing. For critical applications, re-zero 2 to 3 times per year.
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.
