Product Overview

Armstrong PCB Series Pressure Gauge includes three models designed for different industrial applications:

• PCB (Dry-Bottom General Purpose): Copper movement with phosphor-bronze Bourdon tube, suitable for general industrial environments, no liquid filling.
• PCS (Dry-Bottom Steam Type): Stainless steel movement with stainless steel Bourdon tube, rated to 300°C, designed for steam and hot gas applications.
• PSS (Liquid-Filled Steam Type): Based on PCS with glycerin filling to effectively dampen pointer vibration, ensuring clear and stable readings even in high-vibration environments.

All three models are equipped with ring tubes and needle valves, feature a 100mm dial diameter, Class 1.5 accuracy, IP55 protection rating, and identical dimensions. Suitable for pressure measurement of non-explosive, non-crystallizing, non-solidifying liquids or gases in petroleum, chemical, metallurgical, steel, food, and other industries.

Included Accessories

All three pressure gauge models include ring tube and needle valve as standard. When used with steam or other hot gases, the ring tube and needle valve MUST be installed to ensure measurement accuracy and equipment safety.

Technical Specifications

Main Specifications Comparison

Parameter	Dry-Bottom General (PCB)	Dry-Bottom Steam (PCS)	Liquid-Filled Steam (PSS)
Accuracy Class	Class 1.5	Class 1.5	Class 1.5
Measurement Range	0~1.0 / 0~1.6 / 0~2.5 / 0~4.0MPa; extended ranges available	Same as left	Same as left
Working Pressure	Static load: up to 3/4 of full scale; Alternating load: up to 2/3 of full scale; Short-term: up to full scale	Same as left	Same as left
Normal Operating Temp.	-40°C ~ 70°C	-40°C ~ 300°C	-5°C ~ 300°C
Protection Rating	IP55	IP55	IP55
Dial Diameter	Φ100	Φ100	Φ100
Connection	1/2 BSPT	1/2 BSPT	1/2 BSPT
Fitting Thread	M20×1.5 (Brass)	M20×1.5 (304SS)	M20×1.5 (304SS)

Model Designation

Type	Model	Range
Dry-Bottom General	PCB-1.0 / PCB-1.6 / PCB-2.5 / PCB-4.0	0~1.0 / 0~1.6 / 0~2.5 / 0~4.0MPa
Dry-Bottom Steam	PCS-1.0 / PCS-1.6 / PCS-2.5 / PCS-4.0	Same as above
Liquid-Filled Steam	PSS-1.0L / PSS-1.6L / PSS-2.5L / PSS-4.0L	Same as above

Extended Range Options

In addition to standard ranges, all three models are available in lower range options (0~0.1 / 0~0.16 / 0~0.25 / 0~0.4 / 0~0.6MPa). Please refer to the Installation & Maintenance Manual for the complete model table when ordering non-standard ranges.

Material Specifications

Pressure Gauge Materials Comparison

Component	Dry-Bottom General (PCB)	Dry-Bottom Steam (PCS)	Liquid-Filled Steam (PSS)
Instrument Housing	Carbon Steel Black-Sprayed Snap-Fit Cover	Carbon Steel Black-Sprayed Snap-Fit Cover	SS Natural Color Snap-Fit Cover
Instrument Movement	Copper	Stainless Steel	Stainless Steel
Instrument Glass	Flat Instrument Glass	Flat Instrument Glass	Flat Instrument Glass
Bourdon Tube	Phosphor-Bronze Soldered (Tin)	Stainless Steel TIG Welded	Stainless Steel TIG Welded
Fitting	Brass M20×1.5	304SS M20×1.5	304SS M20×1.5
Filled Liquid	None (Dry-Bottom)	None (Dry-Bottom)	Glycerin
Ring Tube	304 Stainless Steel	304 Stainless Steel	304 Stainless Steel
Needle Valve	304 Stainless Steel	304 Stainless Steel	304 Stainless Steel

Key Differences

• PCB vs PCS: Both are dry-bottom with no liquid filling. The core difference is movement and Bourdon tube material — PCB uses copper/phosphor-bronze, PCS uses stainless steel, providing significantly higher temperature resistance (70°C vs 300°C).
• PCS vs PSS: Both share identical materials. PSS adds glycerin filling, which absorbs vibration energy and lubricates movement components, resulting in more stable and clear pointer readings under high-frequency vibration or pulsating pressure conditions.
• When ordering, select based on actual operating conditions: PCB for general industrial use, PCS for steam/high-temperature, PSS for high-vibration steam environments.

Dimensions

Dimension Drawing

Series	D	A	B	H	J	K
PCB / PCS / PSS Series	102	13	87	40	451	286

All three models share identical dimensions and are interchangeable in installation.

Installation

As with all test equipment, the Armstrong pressure gauge is a precision measuring instrument, so special care must be taken during installation and use to ensure its reliability. When used with steam or other hot gases, the pressure gauge MUST be installed with a ring tube and needle valve.

Typical Installation Application

Installation Key Points:

• Before installation, verify that the pressure gauge range matches the measured media pressure range.
• Under static load, pressure should not exceed 3/4 of full scale. Under alternating load, pressure should not exceed 2/3 of full scale. Short-term pressure surges may reach full scale.
• When used with steam or other hot gases, ring tube and needle valve must be installed.
• Installation location should be easily observable and protected from mechanical impact and vibration.
• Fitting thread is M20×1.5. Use appropriate sealing methods during installation to prevent leakage.

Ordering Information

When ordering, please specify the following information:

1. Model (PCB / PCS / PSS + range, e.g., PCB-2.5, PSS-4.0L)
2. Range (standard or extended low-range specification)
3. Connection (1/2 BSPT threaded connection)
4. Quantity