Keyence PX-H71 Stainless Thrubeam Sensor Head, M8

PX-H71: what this PX series sensor is and how its code reads

PX-H71 is a Keyence PX series product, listed by the maker as: Transmissive Sensor Head. The PX series is a heavy-duty photoelectric line in which a stainless steel sensor head connects to a separate amplifier. It is intended for wash-down and chemical environments that destroy plastic sensors. Seven Star LLC supplies PX-H71 in Oman and the GCC as an independent supplier in Muscat, not affiliated with the manufacturer.

PX-H is the sensor head family, 7 designates a thrubeam type, and 1 is the M8 standard version. The 72 version is the M12 thrubeam.

PX-H71 is a thrubeam head set (transmitter plus receiver) in an M8 stainless body. Reach depends on the amplifier mode: 4 m in TURBO, 6 m in SUPER, 12 m in ULTRA and 20 m in MEGA. It detects objects of 4 mm diameter and above, and the housing is SUS303 with a BK7 glass lens.

PX-H71 technical specifications

Values in the table are taken from the maker’s model page for PX-H71. Treat them as nominal and confirm the exact conditions in the instruction manual before final design.

How the sensing principle behind PX-H71 works

The head houses only the optics and a protective lens, while the amplifier carries the electronics, so the part exposed to water, cleaning chemicals and impacts is as simple and as tough as possible. Light from the transmitter either crosses the gap to the receiver (thrubeam) or reflects from a surface. The amplifier measures the received light, compares it with the threshold and applies timer logic.

Four response modes (TURBO, SUPER, ULTRA, MEGA) trade speed for detection distance, which is why the distance in the table is given per mode. Dual displays show the threshold and live value together.

Where PX-H71 fits: related PX series parts

A complete PX channel needs a head and an amplifier. Heads are available in M8 and M12 versions, standard and with armored cable, and in thrubeam or reflective styles; amplifiers are cable or connector type.

The PX series range includes the following part numbers, which are listed for cross-reference: PX-10, PX-10C, PX-H71, PX-H71G, PX-H71TZ, PX-H72, PX-H72G, PX-H61 and PX-H61G. Whether a particular combination is compatible should be confirmed from the maker’s documents. Closely related models from the same family that you may also want to compare include PX-10.

Selecting PX-H71: ordering checklist

• Head style: thrubeam or reflective, M8 or M12, standard or armored.
• Amplifier polarity and cable versus connector.
• Response mode needed versus the distance in the table.
• Wash-down intensity, which affects whether the armored version is justified.
• Cable length options.
• Number of units mounted side by side, for interference prevention.

For PX-H71 specifically, confirm the output type, the connection style and the rated distance shown in the table above against the real installation drawing before placing an order.

Installing and maintaining PX-H71

Mount the heads rigidly, route cables so they are not pulled at the gland, and use the armored spiral version where the cable can be struck. Connect heads to the amplifier with the power off, then run the sensitivity set-up with a typical product.

In service, rinse the lens, inspect the cable for abrasion and verify the hold function and the excess-gain display after cleaning. Stock the same head and amplifier pairing as spares.

Typical applications of PX-H71 in Oman and the GCC

PX sensors serve food and beverage plants, chemical dosing and bottling areas around Oman and the GCC, where equipment is washed down daily with hot water and detergents and where stainless steel housings avoid corrosion.

Small M8 heads fit into narrow frames of filling and packaging machines. Extra heat, dust and humidity are normal in the region, so check the ambient temperature and enclosure rows in the table against the real mounting location, including direct sunlight on outdoor skids.

PX series models compared with PX-H71

The table lists the PX series models in our current range with the maker’s own description, to help you see how PX-H71 differs from its neighbours.

Information to send with your PX-H71 RFQ

• Exact part number: PX-H71 (and quantity, including any matching transmitter, receiver, reflector or head).
• Output polarity required by your PLC input card (NPN or PNP).
• Cable length or connector type and the mounting method.
• Ambient conditions: temperature, washdown, dust and direct sunlight.
• Project reference, delivery location in Oman or the GCC and required lead time.
• Any related items needed, such as brackets, cables, reflectors or a mating amplifier.

Documents and quotation

Send us the part number PX-H71 and we will confirm available documents, including the maker’s datasheet and instruction manual where we can provide them. Prices are quoted per request and are not shown on this page.

Seven Star LLC is an independent supplier in Muscat serving Oman and the GCC. We are not affiliated with the manufacturer, and we quote against your RFQ with delivery and lead time confirmed in the quotation.