INFICON BCG450-SD 353-557 DeviceNet Vacuum Gauge

Description

Specifications

INFICON identifies 353-557 specifically as the BCG450-SD DeviceNet version with a DN 25 ISO-KF vacuum connection. The BCG450 platform combines Bayard-Alpert, Pirani, and capacitance-diaphragm measurement technologies and covers 5 × 10⁻¹⁰ to 1500 mbar. INFICON lists a 20–28 VDC supply range and 0–50 °C operating temperature for the BCG450 family.

The BCG450-SD also incorporates two adjustable switching functions, with the associated relay contacts available through the sensor cable connector. Its fieldbus interface conforms to the DeviceNet standard.

Product Introduction

The INFICON BCG450-SD 353-557 is a DeviceNet-enabled TripleGauge for vacuum measurement across a very wide pressure range. It combines three measurement principles in one instrument, allowing pressure monitoring from atmospheric pressure down into the ultra-high-vacuum region. The 353-557 version uses a DN 25 ISO-KF vacuum connection.

For automation integration, the important distinction is the “-SD” DeviceNet interface. It is not interchangeable with -SP PROFIBUS, -SE EtherCAT, or -PN PROFINET versions simply because the vacuum-gauge body is from the same family. INFICON documents separate part numbers and communication interfaces for these variants.

Installation Guide

Stage 1 — Pre-Installation

1. Isolate the vacuum system and follow the site’s lockout/tagout procedure for electrical equipment.
2. Confirm that the chamber is at a safe pressure before removing the gauge.
3. Verify the complete part number: BCG450-SD / 353-557.
4. Confirm that the existing vacuum port is DN 25 ISO-KF.
5. Record DeviceNet node addressing and network configuration before replacement.
6. Back up the DeviceNet configuration and document the existing switching-function settings.
7. Protect the sensor and vacuum connection from contamination during maintenance.

Stage 2 — Remove the Existing Gauge

1. Disconnect the 20–28 VDC supply and DeviceNet wiring.
2. Verify that the gauge is electrically isolated.
3. Isolate and vent the vacuum chamber according to the equipment manufacturer’s procedure.
4. Disconnect the DN 25 ISO-KF connection without damaging the sealing components.
5. Remove the gauge while preventing particles from entering the vacuum system.
6. Inspect the KF flange, centering ring, O-ring, and clamp for contamination or damage.
7. Compare the removed unit’s nameplate with the replacement before installation.

Stage 3 — Install the -SD

1. Confirm that the replacement is 353-557, not the visually similar 353-558.
2. Install the gauge on the DN 25 ISO-KF connection using clean, compatible vacuum hardware.
3. Reconnect the electrical supply within the specified 20–28 VDC range.
4. Connect the DeviceNet network using the original node configuration.
5. Restore the documented switching-function settings.
6. Ensure the sensor is correctly oriented and mechanically supported.
7. Check that the vacuum connection is clean and properly sealed before evacuation.

Stage 4 — Power-Up and Functional Test

1. Check supply polarity, DeviceNet wiring, and vacuum connections before energizing.
2. Apply power and allow the gauge electronics to initialize.
3. Verify DeviceNet communication with the control system.
4. Confirm that pressure data is being received by the DeviceNet master.
5. Check pressure readings against the expected chamber condition.
6. Verify both configured switching functions.
7. Check DeviceNet diagnostics for communication errors.
8. Confirm stable pressure measurement during pump-down and process operation.
9. Document the final node address, switching parameters, and gauge serial number.

Technical pitfall: Do not conhe to an RS232C interface. INFICON specifically warns that operahe through its RS232C interface causes data-transmission errors. The SD version should be operated through its DeviceNet interface.

For surplus or refurbished inventory, supplier QC should include visual inspection, flange inspection, power-up testing, DeviceNet communication testing, pressure-reading verification across an appropriate test range, switching-output testing, and final nameplate/part-number verification. These tests should only be represented as completed when supported by an actual test report.

BCG450-SD 353-557

BCG450-SD 353-557

FAQ

1. What isON 353-557?

It is an INFICON TripleGauge with a DeviceNet interface and DN 25 ISO-KF vacuum connection.

2. What pressure range he measure?

The specified measurement range is 5 × 10⁻¹⁰ to 1500 mbar, equivalent to approximately 3.75 × 10⁻¹⁰ to 1125 Torr.

3. What is the difference between 353-557 and 353-558?

re DeviceNet gauges, but 353-557 uses a DN 25 ISO-KF connection, while 353-558 uses a DN 40 CF-R connection.

4. Does 353-557 support DeviceNet?

Yes. INFICON identifies as the DeviceNet version, and specifically lists part number 353-557 for the DN 25 ISO-KF configuration.

5. How many switching functions are integrated?

he provides two adjustable switching functions. Their relay contacts are available through the sensor cable connector.

6. Can -SP 353-554ce 353-557?

Not as a communication-interface replacement. 353-554 is the PROFIBUS version, whereas 353-557 is the DeviceNet version. The correct variant must match the fieldbus used by the vacuum-control system.

7. What should I verify before purchasing a used or surplus 353-557?

Verify the model, part number 353-557, DN 25 ISO-KF connection, DeviceNet functionality, sensor condition, vacuum calibration/measurement performance, switching outputs, and actual functional-test results. For semiconductor or other contamination-sensitive vacuum systems, also inspect the vacuum-exposed surfaces and flange hardware before installation.