Keyence AP-34K Pressure Sensor Compound NPN

Keyence AP-34K Two-Color Digital Pressure Sensor

Product Introduction

The AP-34K belongs to the Keyence AP-30 series of digital pressure sensors. This compound pressure model uses NPN open collector output and handles both positive and negative gauge pressure. It suits vacuum pick-and-place heads, leak testing benches, and pneumatic lines that swing between pressure and vacuum. Air and non-corrosive gases serve as the working fluid. The rated range spans 29.9 to -29.9 inchHg, which covers both sides of atmospheric pressure. A 3½-digit two-color 7-segment LED display with 11 mm character height makes readings easy to scan on crowded panels.

Technical Specifications

The display system gives the AP-34K its practical edge on the shop floor. Specifically, the two-color LED switches between red and green to flag threshold states at a glance. Resolution reaches 0.1 inchHg, 0.2 kPa, 2 mmHg, or 0.002 bar depending on the selected unit. Meanwhile, response time offers four selectable settings: 2.5, 5, 100, and 500 ms. The chattering prevention function stabilizes readings on lines that switch between pressure and vacuum.

The control output handles up to 100 mA at 40 V with 1 V maximum residual voltage. Besides, an analog output of 1 to 5 V supports trend logging on a PLC or recorder. The display temperature characteristic stays within ±1 % of F.S. over 0 to 50 °C.

Mechanical and Environmental Parameters

The housing mixes several materials for durability. Polyamide forms the front housing, while a PET sheet protects the front panel. Polysulfone makes up the rear housing, and die-cast zinc forms the pressure port. An oil-proof cabtyre cable resists lubricant exposure on machine tools.

Operating temperature spans 0 to +50 °C with no freezing. Relative humidity stays within 35 to 85 % RH without condensation. Proof pressure reaches 72.5 PSI, which guards against occasional overpressure events on either side of the range. Vibration resistance covers 10 to 55 Hz at 1.5 mm double amplitude for 2 hours in each X, Y, and Z direction. Protection rating data is not published, so installers should house the unit in a suitable enclosure for wet areas. Weight sits at roughly 120 g.

Installation Guide

First, mount the AP-34K on a flat panel using the rear mounting threads. Keep the pressure port clear of sealant debris. Next, connect the tubing to the die-cast zinc port and secure it with a clamp. After that, wire the supply at 12 to 24 VDC and confirm polarity before power-up. Then set the output mode to N.O. or N.C. as the machine logic requires.

Use the front keys to select units and threshold values. For instance, set two thresholds when the line switches between vacuum and pressure states. Besides, route the cable away from inverter output lines to limit electrical noise. Finally, verify the analog output against a reference gauge and lock the settings.

Packaging List

• 1 × Keyence AP-34K pressure sensor

• 1 × Oil-proof cabtyre cable

• 1 × Mounting bracket and screws

• 1 × Protective packaging

Shipping

Orders ship via Fedex, UPS, DHL. Stock items usually leave the warehouse within 1–2 business days after payment confirmation.

FAQ

Q1: What pressure range does the AP-34K cover?
A: The AP-34K has a compound rated range of 29.9 to -29.9 inchHg, so it reads both positive pressure and vacuum.

Q2: How does compound pressure differ from the AP-31K or AP-32K?
A: The AP-34K spans both positive and negative gauge pressure, while the AP-31K covers vacuum only and the AP-32K covers positive pressure only.

Q3: Can the response time be adjusted?
A: Yes. Users select 2.5, 5, 100, or 500 ms, and the chattering prevention function stabilizes switching readings.

Q4: What fluid can I use with this sensor?
A: Air or non-corrosive gases work well. Avoid corrosive media that attack the die-cast zinc pressure port.

Q5: Does it include an analog output?
A: Yes. The AP-34K provides 1 to 5 V analog output with a minimum load impedance of 47 kΩ.