AMAT 0190-51546 Hot Ion/Pirani Vacuum Gauge 750 Torr

Description

Product Introduction

Applied Materials 0190-51546 is a Hot Ion/Pirani vacuum gauge used for vacuum measurement in semiconductor processing equipment. Multiple independent listings identify the exact AMAT part number as a Hot Ion/Pirani gauge, with 750 Torr appearing consistently in product titles and historical listings.

The combination of Pirani and hot-ion measurement technologies is significant. It allows vacuum measurement over a substantially wider pressure regime than relying on a single measurement principle. In practical AMAT equipment maintenance, this type of gauge can be involved in chamber-pressure monitoring, pump-down verification, process interlocks, and vacuum-control diagnostics.

A documented physical listing identifies the unit as a 750 Torr Hot Ion/Pirani gauge with a 2.75-inch CF ConFlat flange. That listing also reports a 0.8–10 V output and 20–28 V supply. These electrical values should be treated as unit/configuration-specific unless confirmed against the gauge label or OEM documentation.

 

Part Number and Revision Identification

The primary procurement identifier is:

Applied Materials 0190-51546

Known market records include:

• 0190-51546 Rev. 02
• 0190-51546 Rev. 03
• 0190-51546 with sensor
• 0190-51546 / 0190-23965 combinations

Historical market data contains numerous listings specifically identifying Rev. 02 and Rev. 03 as Hot Ion/Pirani gauges.

A current specialist gauge catalog also identifies the exact product as AMAT Hot Ion/Pirani Gauge 0190-51546 Rev 3.

For replacement procurement, therefore, do not record only “0190-51546.” Capture the revision and whether the sensor/gauge assembly is supplied complete.

 

Technical Specifications

Specification	Detail
AMAT P/N	0190-51546
Instrument Type	Hot Ion/Pirani vacuum gauge
Measurement Technology	Hot-ion + Pirani
Common Full-Scale Listing	750 Torr
Revision Examples	Rev. 02 / Rev. 03
Flange	2.75-inch CF reported on one physical unit
Output	0.8–10 V reported on one listing
Supply	20–28 V reported on one listing
Additional Power Data	11–27 VDC / 2 W reported on one listing
Reported High Power Figure	18 W reported on one listing
Weight	0.38 kg reported by one used-parts listing
Installation	Semiconductor vacuum-processing equipment

Specification Integrity Warning

There is an important distinction between confirmed product identity and complete engineering specifications.

The 0190-51546 identity as an AMAT Hot Ion/Pirani gauge is strongly supported.

However, public listings do not provide a sufficiently authoritative complete datasheet for every revision. Therefore, parameters such as:

• Exact measurement range
• Ionization threshold
• Pirani operating range
• Accuracy
• Response time
• Pinout
• Filament characteristics
• Output scaling
• Exact supply requirements

should be confirmed from the actual revision or equipment documentation before being treated as engineering specifications.

How the Gauge Works

The 0190-51546 combines two vacuum-measurement principles.

Pirani Measurement

A Pirani element uses the thermal behavior of a heated element to infer gas pressure.

It is particularly useful in the higher-pressure portion of the vacuum system’s measurement range.

Hot-Ion Measurement

A hot-ion gauge uses electron emission and ionization of residual gas molecules to determine pressure at much lower pressures.

The two technologies therefore complement each other.

In a semiconductor tool, the gauge can provide vacuum information across different stages of chamber operation rather than relying on one sensor principle over the entire process.

 

Field Application

The 0190-51546 is particularly relevant to vacuum systems where pressure information is required for:

• Pump-down monitoring
• Chamber vacuum verification
• Process qualification
• Vacuum interlocks
• Pressure-control diagnostics
• Leak troubleshooting
• Equipment startup sequences

The exact AMAT tool and chamber configuration should always be confirmed from the installed equipment documentation.

 

Field Troubleshooting

1. Separate Gauge Failure From a Real Vacuum Problem

A pressure alarm does not automatically mean the gauge has failed.

First compare:

Actual chamber condition → independent pressure reference → gauge output → controller reading.

If an independent gauge indicates the expected pressure while the AMAT controller reports an abnormal value, the 0190-51546 signal chain becomes a stronger suspect.

2. Check the Vacuum System

Before replacing the gauge, inspect:

• Pump operation
• Isolation valves
• Chamber seals
• Foreline condition
• Vacuum plumbing
• Process gas isolation
• Chamber contamination
• Recent maintenance activity

A genuine leak or valve problem can create exactly the same symptom as a defective gauge.

3. Inspect the Gauge Installation

Check:

• CF flange condition
• Knife-edge sealing surface
• Mounting hardware
• Gauge orientation
• Cable connection
• Connector condition
• Evidence of contamination
• Mechanical damage

A damaged CF sealing surface can cause a vacuum problem that has nothing to do with the gauge electronics.

4. Verify the Electrical Signal

Where equipment documentation permits, compare the gauge’s output with the expected pressure.

Do not assume a generic voltage-to-pressure conversion. The scaling must be established from the correct gauge revision and AMAT system configuration.

 

Incoming QA / Test SOP

For a replacement 0190-51546, use the following receiving checklist:

Inspection	Acceptance Criteria
AMAT P/N	0190-51546
Revision	Match installed or approved revision
Gauge type	Hot Ion/Pirani
Full-scale designation	Verify required 750 Torr configuration
Flange	Verify exact CF size/configuration
Connector	No damage or corrosion
Sensor/filament	No visible damage where inspection is possible
Housing	No deformation or contamination
Vacuum test	Pump-down and pressure response verified
Electrical test	Output and supply verified against approved specification
Calibration	Verify calibration status where applicable
Condition	New Surplus / Used Tested / Refurbished / Untested
Warranty	Confirm written terms

A supplier’s statement that the gauge is “working” is not equivalent to a calibrated vacuum test.

For a critical production spare, the preferred qualification is an actual vacuum-system functional test.

 

⚠️ Veteran’s Tech Trap Guide

Trap 1 — Confusing the Gauge With the Sensor Only

Some listings describe 0190-51546 / 0190-23965 together as a Hot Ion-Pirani gauge with sensor.

Before purchasing, determine whether the quoted item contains:

• Complete gauge assembly
• Sensor assembly
• Electronics
• Cable
• Mounting hardware

Do not assume the photograph represents everything included.

Trap 2 — Ignoring Revision

Market records show both Rev. 02 and Rev. 03 units.

For a legacy AMAT installation, revision matching is preferable unless an approved cross-revision substitution has been established.

Trap 3 — Assuming 750 Torr Means Every Specification Is Identical

“750 Torr” is a useful identification clue, but it does not establish every electrical or mechanical parameter.

Verify the actual revision and flange configuration.

Trap 4 — Replacing the Gauge Before Checking the Chamber

A vacuum leak, contaminated valve, failed pump, or incorrect isolation state can produce a pressure indication that looks like a gauge problem.

Always establish whether the reported pressure is physically plausible before replacing instrumentation.

 

Spare-Inventory Strategy

For an AMAT tool where 0190-51546 is required for vacuum monitoring or an interlock chain, the gauge should generally be classified as a critical instrumentation spare.

Recommended inventory fields:

• AMAT P/N
• Revision
• Gauge type
• Full-scale range
• Flange configuration
• Sensor included
• Calibration/test status
• Date last tested
• Tool compatibility
• Condition
• Warranty expiration

For one critical tool, one tested spare is a reasonable starting point. If several tools use the same gauge configuration, consolidate inventory only after confirming revision and physical compatibility.

 

New Surplus vs. Used vs. Refurbished

New Surplus

Verify:

• Genuine AMAT identification
• Correct revision
• Correct flange
• No previous vacuum exposure where this matters
• Proper storage
• Sensor condition

Used Tested

A used gauge can be suitable if its vacuum response is actually tested.

A specialist listing currently offers 0190-51546 as used inventory, while other market records show multiple used Rev. 02/03 units.

Refurbished

Ask whether refurbishment included:

• Sensor replacement
• Cleaning
• Electrical verification
• Vacuum testing
• Calibration
• Connector repair

Untested / As-Is

Treat as a repair candidate rather than a production-ready spare.

J316Gallery, for example, lists a 0190-51546 unit as pre-owned and explicitly states that its parts are untested, sold as-is, without warranty or returns.

 

Frequently Asked Questions

What is AMAT 0190-51546?

It is an Applied Materials Hot Ion/Pirani vacuum gauge, commonly identified as a 750 Torr gauge.

What measurement technology does it use?

It combines Hot Ion and Pirani vacuum-measurement principles.

What revisions are available?

Secondary-market records document at least Rev. 02 and Rev. 03 units.

Is 0190-51546 a vacuum gauge or a gauge controller PCB?

The strongest AMAT-specific evidence identifies 0190-51546 as the physical Hot Ion/Pirani gauge, not an INFICON controller PCB. The latter description appears on some generic reseller pages and should not be used for AMAT procurement.

What flange does it use?

A documented physical listing specifies a 2.75-inch CF ConFlat flange. Verify the actual unit before ordering because flange configuration should be matched to the installed tool.

Is New Surplus 0190-51546 preferable?

If genuine, correctly stored, revision-compatible, and complete, New Surplus is generally attractive for a critical spare. A tested used gauge can also be appropriate if its vacuum response has been verified.

Does every supplier provide a warranty?

No. Warranty varies significantly. Some suppliers provide limited warranties, while some explicitly sell units as-is without warranty or returns.

 

Bottom Line

Applied Materials 0190-51546 is a Hot Ion/Pirani vacuum gauge, commonly specified as a 750 Torr gauge and documented in Rev. 02 and Rev. 03 versions.

The safest procurement identification is:

AMAT 0190-51546 → Hot Ion/Pirani Vacuum Gauge → verify revision → verify flange → verify sensor/assembly completeness.

Do not rely solely on generic reseller specifications for electrical output, supply voltage, accuracy, or pressure range. For a production replacement, match the physical revision and vacuum-interface configuration, then require an actual functional or vacuum test whenever possible.