Sensors and Gauges
C-122-30-0-160-PSI-VSM
Brooks Instrument 122 Series 2-Inch Compound Pressure Gauge
About this part
C-122-30-0-160-PSI-VSM is a legacy Brooks Instrument 122 Series 2-inch stainless-steel indicating gauge for local pressure monitoring in high-purity systems. Its documented ordering code specifies center-back mounting, a compound scale from 30 inHg vacuum through 160 psi, and a face-seal swivel-male process connection
Configurations vary. Verify the exact unit before choosing a replacement.
No archived photo available
Key Facts
Specifications
| Model/series | 122 Series 2-inch stainless-steel gauge |
| Socket orientation | Center back mounted |
| Pressure range | 30 inHg vacuum through 160 psi |
| Scale units | InHg on the vacuum side; psi on the pressure side |
| Process connection | Face-seal swivel male (VSM) |
| Accuracy | 1% of full scale |
| Helium leak check | 4 × 10^-9 inboard standard cc/sec |
| Proof pressure | 110% |
| Burst pressure | 400% |
| Operating ambient range | 0 to 160°F (-18 to 71°C) |
| Compensating range | 20 to 135°F (-7 to 57°C) |
| Storage range | -20 to 135°F (-29 to 79°C) |
| Case | Electropolished 300 Series stainless steel |
| Bezel and lens | One-piece screw-on polycarbonate |
| Socket | 316L stainless steel |
| Movement | 300 Series stainless steel |
| Bourdon tube | 316L stainless steel |
| Standard finish | 32 Ra (manufacturer specification; unit not stated) |
| Cleaning | Cleaned for oxygen service to ANSI B40.1 Level IV specifications |
| Safety relief | Unrestricted rear blow-out plug |
| Dial | White with black markings; “Use No Oil” marked in red |
| Approximate shipping weight | 0.5 lb (0.23 kg) |
What Does C-122-30-0-160-PSI-VSM Mean?
The identifier contains all five fields in Brooks Instrument’s documented 122 Series model-code structure.
| Segment | Field | Interpretation |
|---|---|---|
| C | Socket orientation | Center back mounted |
| 122 | Model/series | 2-inch stainless-steel gauge |
| 30-0-160 | Pressure range | Documented compound range from 30 inHg vacuum through 160 psi |
| PSI | Units | Pounds per square inch; the range table expresses the vacuum portion in inHg |
| VSM | Connection | Face-seal swivel male |
Legacy Status and Replacement Selection
Brooks Instrument classifies the C122 and S122 pressure gauges as legacy products and directs customers to its current PG mechanical pressure-gauge family. The replacement reference is family-level guidance, not proof of a drop-in substitute. Match dial size, center-back orientation, compound range, connection geometry, cleanliness requirements and accuracy before replacement; current PG20 accuracy specifications differ from the C122’s 1%-of-full-scale specification.
Typical Applications
The 122 Series was designed for local monitoring in high-purity semiconductor gas-delivery equipment.
- Bulk-gas systems
- Gas cabinets
- Gas-distribution systems
- Gas panels
Documentation Downloads
Local PDF copiesPart Photos
0 imagesHistorical archive images for identification, labels, connectors, and condition reference, not current inventory.
Historical Listings & Prices
Historical listing data, not a current offerThe typical recorded price range is $135.00 to $135.00. Based on 1 archived listing record; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- Brooks C-122-30-0-160-PSI-VSM, 1/4" MVCR Gauge -30-0-160 Range Center Back Mount