The Senva P4-0050-BU2LX is a P4 Precision Series dry-media differential pressure transmitter with a fixed 0 to 0.50 in WC unidirectional range and a 0-10 VDC output, certified to ±0.25% of range with 7-point NIST calibration. A MEMS silicon piezoresistive element senses dry, oil-free air or nitrogen for building pressure, filter status and duct static applications where the sensor accuracy has to be documented. It ships with an on-board LCD.
Specifications on this page are taken from the Senva P4 Precision Dry Pressure datasheet, Installation Instructions document 152-0351-0H revised 3/19/2026, and Senva's P4 Series Engineering Specifications.
- Building (zone) pressure control
- Filter condition and differential monitoring
- Supply and return duct static pressure
- OEM HVAC equipment
- Data centers
WARRANTY
Key Features
7-Point NIST Certificate
Every unit ships with a 7-point NIST calibration certificate listing applied pressure, measured output and non-linearity error at each point. Senva certifies conformance to ISO 17025 with NIST-traceable equipment.
Precision Calibrated MEMS Element
A precision-calibrated, temperature-compensated MEMS silicon piezoresistive element. The P4 supports high-density DIN mounting that saves valuable panel space.
Non-Position Sensitive
Senva specifies the pressure element as precision calibrated, temperature compensated and non-position sensitive, and supports flat, side and DIN mounting orientations.
Push-Button and Remote Zero
Zero the sensor by holding the ZERO SET button for two seconds, or trigger it remotely through a dry-contact closure from the controller.
On-Board LCD
The LCD shows the live reading during setup and commissioning. Senva notes the unit can be DIN mounted forward so the display stays readable in the panel.
Flexible Mounting
Screw mount directly to duct, panel mount with self-tapping screws, or snap to DIN rail forward or sideways to conserve panel space.
Technical Specifications
| Specification | P4-0050-BU2LX |
|---|---|
| Product Type | Dry-media differential pressure transmitter |
| Series | Senva P4 Precision Series |
| Pressure Range | 0 to 0.50 in WC (unidirectional) |
| Approx. SI Equivalent (calculated) | 124 Pa full scale - unit conversion from the inch w.c. range, not a Senva catalog Pa range |
| Output Signal | 0-10 VDC, 3-wire |
| Outputs Available in Series | 4-20 mA loop powered, 4-20 mA 3-wire, 0-5 VDC, 0-10 VDC |
| Power Supply | 12-30 VDC or 24 VAC, 30 mA max |
| Accuracy | ±0.25% of range |
| Calibration | 7-point NIST calibrated |
| Calibration Standard | Senva certifies on the calibration certificate supplied with each unit that the certification conforms to ISO 17025 and that all certification equipment is NIST traceable |
| Zero Tolerance | Included in accuracy specification |
| Span Tolerance | ±1.00% |
| Zero Drift (1 year) | 0.004 in WC/year max; 0.4% for units over 0.5 in WC |
| Thermal Shift (Zero and Span) | 0.02% FSO/C (0.01% FSO/F) measured from 22 C (72 F) |
| Auto-Zero Input | Push-button and contact closure |
| Display | LCD |
| Duct Probe | Not included |
| Sensor Type | MEMS silicon piezoresistive, precision calibrated |
| Media Compatibility | Dry, oil-free air or nitrogen (N2) |
| Response Rate | 8 seconds (full scale response time) |
| Position Sensitivity | Non-position sensitive |
| Overpressure | 41.5 in WC (models up to 5 in WC range) |
| Max Static Line Pressure | 41.5 in WC (models up to 5 in WC range) |
| Burst Pressure | 83 in WC (models up to 5 in WC range) |
| Operating Temperature | -4 to 140 F (-20 to 60 C) |
| Compensated Temperature | -4 to 140 F (-20 to 60 C) |
| Operating Humidity | 0 to 95% RH, non-condensing |
| Pressure Connections | Hose barbs accept 1/8 in and 1/4 in ID tubing |
| Mounting | Screw mount to duct, panel mount with self-tapping screws, or DIN rail (forward for LCD viewing, or sideways to save panel space) |
| Terminal Torque | 3.5 in-lb |
| Enclosure Material | UL94 5VB, ABS |
| Enclosure Rating | NEMA 1 |
| Dimensions (Transmitter) | 4.75 in H x 1.82 in W x 0.90 in D |
| Agency Compliance | CE, RoHS |
| Country of Origin | Made in USA - Senva, Beaverton, Oregon |
| Warranty | 7-year warranty |
| Manufacturer Part Number | P4-0050-BU2LX |
Note: the P4 is rated for dry, oil-free air or nitrogen only. Senva does not intend the P4 for life-safety, nuclear or hazardous/classified locations. Form a drip loop in the tubing so condensation cannot reach the hose barbs. Senva's P4 Series Engineering Specifications sheet states an ambient range of -20 to +50 C. The figure above is from the current P4 Precision datasheet and installation instructions, which control; confirm with Senva if your specification depends on the upper limit.
Documentation
P4 Precision Dry Pressure DatasheetInstallation Instructions (152-0351-0H)P4 Series Engineering SpecificationsSample 7-Point NIST Calibration CertificateApp Note: Maximum Length of Dry-Pressure HoseSenva BABAA / TAA / ARRA DeclarationRelated P4 Precision Models
Frequently Asked Questions
What pressure range does the Senva P4-0050-BU2LX measure?
P4-0050-BU2LX is a 0 to 0.50 in WC (unidirectional) transmitter (approximately 124 Pa full scale by calculation). The range is set at the factory by the 0050 range code in the part number and is not field adjustable.
Is the Senva P4-0050-BU2LX NIST calibrated?
Yes. This part number specifies ±0.25% of range with 7-point NIST calibration. The certificate lists 7 applied-pressure points with the measured output and non-linearity error at each one, and Senva certifies conformance to ISO 17025 using NIST-traceable equipment. Senva's stated accuracy includes non-linearity, hysteresis and repeatability at 70 F.
What output signal and supply voltage does P4-0050-BU2LX use?
It provides a 0-10 VDC signal on a three-wire connection. Power the sensor from 12-30 VDC or 24 VAC and read the output against signal common. Senva lists 4-20 mA loop powered, 4-20 mA 3-wire, 0-5 VDC and 0-10 VDC across the P4 Precision Series, and the output is fixed by the part number rather than field selectable. Terminals are torqued to 3.5 in-lb.
Does P4-0050-BU2LX include a duct probe?
No - the X in the last position of this part number specifies no probe. Senva offers the RP-6 remote/duct probe separately, and the same transmitter is cataloged with the probe by changing that last character to P.
Is the Senva P4-0050-BU2LX Made in USA and Buy America compliant?
Yes. Senva manufactures the P4 series in Beaverton, Oregon, and lists P4 series dry pressure products on its Buy America / Buy American Act / BABAA / ARRA / TAA Commerce Declaration updated 04/21/2026, with domestic component cost exceeding 65 percent.
How do I zero the Senva P4-0050-BU2LX?
With power applied and no pressure on the ports, hold the ZERO SET button for two seconds; the LED pulses when zeroing completes. For best results, tie the high and low ports together while zeroing. Zeroing can also be triggered remotely through a dry-contact closure.
- Series:
- P4 Precision
- Product Type:
- Dry Differential Pressure Transmitter
- Pressure Range:
- 0 to 0.50 in WC
- Pressure Range Class:
- Very Low (under 1 in WC)
- Direction:
- Unidirectional
- Output Signal:
- 0-10 VDC
- Accuracy:
- 0.25% of Range
- Calibration:
- 7-Point NIST Calibrated
- Display:
- LCD
- Probe:
- No Probe
- Made in USA:
- Yes
