The Senva P4-0250-AB1LX is a P4 Value Series dry-media differential pressure transmitter with a fixed 2.5 in WC bi-directional range and a 0-5 VDC output, accurate to ±1.00% of range. A MEMS silicon piezoresistive element senses dry, oil-free air or nitrogen for building pressure, filter status and duct static applications. It ships with an on-board LCD.
Specifications on this page are taken from the Senva P4 Value Dry Pressure datasheet and Installation Instructions document 152-0351-0H, revised 3/19/2026.
- Building (zone) pressure control
- Filter condition and differential monitoring
- Supply and return duct static pressure
- OEM HVAC equipment
- Data centers
WARRANTY
Key Features
MEMS Sensing Element
A precision-calibrated MEMS silicon piezoresistive element with microprocessor-based features. In Senva's own comparison against the capacitive, discrete-electronics Model 264, this is what makes the P4 compact enough for high-density DIN side mounting.
Non-Position Sensitive
Senva specifies the P4 as non-position sensitive, so it can be mounted flat, on edge or on its side without re-zeroing for orientation.
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, so the range and scaling can be confirmed at the device instead of at the front end.
Flexible Mounting
Screw mount directly to duct, panel mount with self-tapping screws, or snap to DIN rail in either the back or left-side orientation to conserve panel space.
Conduit Ready
An optional conduit and terminal cover with a 3/4 in knockout lets the P4 land in conduit without a separate enclosure or adapter model.
Technical Specifications
| Specification | P4-0250-AB1LX |
|---|---|
| Product Type | Dry-media differential pressure transmitter |
| Series | Senva P4 Value Series |
| Pressure Range | 2.5 in WC fixed range, bi-directional |
| Approx. SI Equivalent (calculated) | 622 Pa full scale - unit conversion from the inch w.c. range, not a Senva catalog Pa range |
| Output Signal | 0-5 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 | ±1.00% of range |
| 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) |
| 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 (back and left-side orientations) |
| 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 | P4-0250-AB1LX |
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 documents this model as a fixed-range bi-directional unit but does not publish the negative and positive scaling endpoints; confirm exact output scaling with Senva before configuring the controller.
Documentation
P4 Value Dry Pressure DatasheetInstallation Instructions (152-0351-0H)App Note: Maximum Length of Dry-Pressure HoseComparison: Senva P4 vs Model 264Senva BABAA / TAA / ARRA DeclarationRelated P4 Value Models
Frequently Asked Questions
What pressure range does the Senva P4-0250-AB1LX measure?
P4-0250-AB1LX is a 2.5 in WC fixed range, bi-directional transmitter (approximately 622 Pa full scale by calculation). The range is set at the factory by the 0250 range code in the part number and is not field adjustable. Senva documents this model as a fixed-range bi-directional unit but does not publish the negative and positive scaling endpoints; confirm exact output scaling with Senva before configuring the controller.
What output signal and supply voltage does P4-0250-AB1LX use?
It provides a 0-5 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 Value Series, and the output is fixed by the part number rather than field selectable. Terminals are torqued to 3.5 in-lb.
How accurate is the Senva P4-0250-AB1LX?
±1.00% of range, which per Senva includes non-linearity, hysteresis and repeatability at 70 F. NIST-calibrated accuracy options are offered elsewhere in the P4 Value line if a documented calibration is required.
Does P4-0250-AB1LX 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 also cataloged with the probe by changing that last character to P.
How do I zero the Senva P4-0250-AB1LX?
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.
Is the Senva P4-0250-AB1LX 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.
- Series:
- P4 Value
- Product Type:
- Dry Differential Pressure Transmitter
- Pressure Range:
- 2.5 in WC
- Pressure Range Class:
- Low (1 to 5 in WC)
- Direction:
- Bidirectional
- Output Signal:
- 0-5 VDC
- Accuracy:
- 1.00% of Range
- Calibration:
- Factory Calibrated
- Display:
- LCD
- Probe:
- No Probe
- Made in USA:
- Yes
