SMC ISE40-01-22-M High Precision Digital Pressure Switch

A high-precision digital pressure switch with analog output

ISE40-01-22-M is a high-precision digital pressure switch for positive pressure from the SMC ZSE40/ISE40 series. It has a 3 1/2 digit LED display, two NPN switch outputs and a 1 to 5 V analog output, all in one body with an IP65 enclosure. It is used to monitor and control air pressure in clamping, press, blow and pressure-regulation circuits.

The code reads ISE40 (positive pressure, rated range 0.000 to 1.000 MPa), 01 (R1/8 piping with M5 female threads), 22 (NPN open collector, two outputs, plus analog output) and M (SI unit only, MPa for positive pressure). The lead wire is the 0.6 m standard, because the letter L (3 m) is not added; no bracket is included.

Technical specifications

Two outputs and one analog signal

The two switch outputs can be set separately, for example as a low-pressure alarm and a high-pressure alarm, or as a window comparator that tells when the pressure is within a band. The analog 1 to 5 V output lets a PLC or a recorder see the actual pressure value in addition to the on-off state. A green LED shows output 1 on, and a red LED shows output 2 on.

The catalogue also lists versions with an auto-shift input (code 30 and 70), for use where the set value must shift by an external signal, but those are different codes. Types with the unit switching function (no M) are not sold for use in Japan under the measurement law, as the catalogue notes.

Installation

Piping options are R1/8 or NPT1/8 with M5 female threads, Rc 1/8 for the two-direction reverse-pressure type, or one-touch fittings for 4 mm and 6 mm tube. Brackets A and B, a panel-mount adapter and a front protective cover can be ordered. Because the withstand pressure is 1.5 MPa, the switch can take line spikes better than the vacuum model, but it should not be connected to liquids or corrosive gases.

Output is NPN, so the load must be connected to the plus side of the power supply; confirm the input type of your PLC before ordering and select the PNP version (code 62) when a PNP input is needed.

Related SMC products: SMC ISE30A-01-N-M Digital Pressure Switch -0.1 to 1 MPa and SMC ZSE30A-01-N-M Digital Vacuum Switch 0 to -101 kPa.

Documents and quotation

The legacy ISE40 is no longer catalogued, so the document linked below is the SMC ZSE40A/ISE40A operation manual for the successor series. It has the how-to-order page, specifications, wiring, settings, dimensions and precautions. Please confirm pressure type, piping, output type, unit and lead length before ordering. Other instruments are listed under Pressure Instrumentation. Seven Star LLC is an independent supplier and quotes the exact code on request.

ISE40-01-22-M Status & Successor

The ISE40-01-22-M belongs to the original ZSE40/ISE40 series, which SMC lists as available only until stock is depleted. Its successor is the ZSE40A/ISE40A series. SMC has since announced that the ISE40A is also being discontinued and will be replaced by the ISE20 series. For a new machine, check the ISE20 first. To replace a unit that is already installed, compare the ISE40A or ISE20 data with the ISE40-01-22-M details on this page.

ISE40-01-22-M Compared with the ISE40A

The table compares the legacy switch with ISE40A data from the SMC operation manual. The two series are similar in function, but they are not identical, so check the differences before you swap one for the other.

In the ISE40A manual, the output code R means two NPN outputs plus a 1 to 5 V analog output, which is the closest match to the “22” output of the ISE40-01-22-M. Code S gives two NPN outputs with 4 to 20 mA, and codes T and V are the PNP versions. The same R and S codes can also be configured as an auto-shift input instead of the analog output.

How the ISE40-01-22-M Works

A silicon piezoresistive sensor converts the air pressure into an electrical signal. The microprocessor compares it with the two set values and switches each NPN output independently. At the same time it drives a voltage output proportional to the pressure. In hysteresis mode each output switches at its set point and resets after the hysteresis band. In window comparator mode the output is on only while the pressure lies inside a band. For this reason, the hysteresis should be set larger than any pressure fluctuation around the set point, otherwise the output will chatter.

Using the analog output

The analog signal has an output impedance of about 1 kΩ. When a PLC input card reads it, the input impedance of the card affects the voltage it sees, so use a high-impedance analog input. SMC recommends a noise filter, such as a line noise filter or ferrite element, when the analog output is used in an electrically noisy environment.

Installation & Maintenance

• Mount with the supplied brackets or a panel adapter, and tighten the R1/8 thread with a spanner on the metal port, never by the body.
• Keep the atmospheric vent free. Where water or dust may splash, SMC suggests fitting a tube such as TU0425 into the vent port and routing it to a safe place.
• Connect the wiring with the power off, and run the switch cable apart from power and high-voltage lines to avoid noise.
• Allow for a drift of about 1% in the display and analog output just after power-on, as noted in the manual.
• Use the switch only with air, inert gases and non-flammable gases.

Typical Applications in Oman & the GCC

Main supply monitoring, clamp and press pressure confirmation, and pressure logging through the analog output in factories, packaging plants and process skids across Oman and the GCC.

Why Source the ISE40-01-22-M from Seven Star LLC

Seven Star LLC supplies SMC pressure switches across Oman and the GCC. Request a quote, and our team can help confirm the correct ordering code for a replacement ISE40-01-22-M, or the matching ISE40A or ISE20 successor.