Vaisala PDT101

Differential pressure transmitter for cleanrooms and air handling systems.

Product Overview

Manufacturer: Vaisala
Product: PDT101
Type: Installed measurement transmitter
Range / measured parameters: Low differential pressure; range varies by model
Communication / outputs: Current or voltage output

Engineering and Selection Considerations

Confirm the exact manufacturer’s ordering code, current availability, calibrated measurement range, output protocol, power supply, operating environment and mounting requirements. Technical parameters can change between models, ordered options or product generations.

Official Technical Documentation

Official manufacturer product information →

Independent AirAlign product reference. Source reviewed 13 October 2026. The manufacturer’s technical documents remain authoritative.

Product category

Vaisala PDT101 — exact range, loop loading and cleanroom selection

Based on Vaisala’s official B211082EN-K (2026) model datasheet, this section distinguishes bidirectional cleanroom pressure transmitters from the unidirectional fan/filter models and the actual analog output configuration.

Attribute	Original manufacturer data	Engineering note
Available pressure ranges	±60 Pa / ±125 Pa (bidirectional), 0–500 Pa (unidirectional); inch-of-water equivalents	Choose model by expected pressure sign and span, not only adjustable zero.
Published accuracy	0.4% of full span for bidirectional; 1% of full span for unidirectional	At very low differential pressure, %span is not %reading.
Response / stability	250 ms t10–90; 15-second warm-up; ±0.25% of span/year stability	Set commissioning zero tolerance and inspection interval.
Current output	Two-wire 4–20 mA; 12–36 V DC supply	Maximum receiver/loop resistance is (supply voltage minus 12 V)/0.022 A.
Voltage output	0–5 V version: 11.5–36 V DC or 24 V AC; 0–10 V: 14–36 V DC or 24 V AC	Separate three-wire voltage output ordering codes from the two-wire current loop.
Connection	1/4-inch barbed pressure ports; wall or DIN-rail mounting; detachable terminals	Prevent kinked tubes, leakage, condensation and accidental reversed HI/LO reference.
Ambient / protection	−18 to +70 °C; IP40; dry, non-corrosive and non-conducting gas only	Not weatherproof, washdown-ready or Ex-approved just because it measures pressure.
Adjustments	Front-access zero ±5% span and span ±3% span	Re-verify calibration after mounting or tubing changes.

Ordering and calibration boundaries

PDT101-P4C is ±60 Pa / 4–20 mA; P4V is ±60 Pa / 0–5 V; P10C is 0–500 Pa / 4–20 mA; P10V is 0–500 Pa / 0–10 V. These are distinct physical orderable versions. The manufacturer’s P10Cx, P10Vx, W10Cx, and W10Vx codes are explicitly listed as not including a calibration certificate. Do not describe every PDT101 as shipped with an individual calibration report.

For a cleanroom differential-pressure cascade, document each room’s reference pressure, alarm direction, tubing route and measured zero at installation. A proof-pressure tolerance of 1 bar means survival of overload, not a calibrated pressure range. Validate loop resistance when connecting a 4–20 mA input through an isolation barrier; pressure readings below nominal detection levels cannot be certified from a generic product catalog alone.

Original technical source: Vaisala PDT101 B211082EN-K technical data (2026). Check revision and part number prior to commissioning.