Vacuum & Compound Pressure Gauge (-1 to 0 to 15 bar)

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Product Overview

Our Vacuum & Compound Pressure Gauges are designed to measure both negative pressure (vacuum) and positive pressure on a single instrument — typically displayed as a dial reading from −1 bar (full vacuum) through 0 bar (atmospheric) to a positive pressure limit such as +5, +9, or +15 bar. The compound Bourdon tube or dual-element design accurately captures the full range of pressure states encountered in steam condensate systems, vacuum distillation, autoclave sterilizers, refrigeration circuits, and any process that transitions between vacuum pull-down and positive pressure operation. A single gauge replaces the need for separate vacuum and pressure gauges on the same process connection, simplifying panel design and reducing installation cost.

Technical Specification Sheet

Parameter	Detail
Compound Range	−1 to 0 to 3 bar / −1 to 0 to 5 bar / −1 to 0 to 9 bar / −1 to 0 to 15 bar (standard ranges)
Vacuum-Only Range	−1 to 0 bar (full vacuum) available as separate model
Accuracy Class	±1.6% or ±2.5% of full scale (positive and negative spans)
Nominal Size	DN 63 mm (2.5"), 100 mm (4"), 150 mm (6")
Wetted Parts Material	Copper Alloy (standard) or Stainless Steel 316L
Case Material	Stainless Steel 304 or Steel (black finish)
Fill Medium	Dry (standard) or Glycerin/Silicone oil (for vibrating applications)
Process Connection	G1/4, G1/2, NPT1/4, NPT1/2 (bottom or back)
Scale	Dual-scale (vacuum/positive) on single color-coded dial

Key Features

Single-instrument measurement of both vacuum and positive pressure on a clearly legible color-coded compound dial, eliminating the need for two separate instruments and two process connections.
The compound Bourdon tube design maintains ±1.6% FS accuracy across both the negative and positive pressure ranges on the same dial — no accuracy penalty compared to using separate vacuum and pressure gauges.
Available with stainless steel 316L wetted parts and glycerin fill for corrosive media and vibrating installations (refrigeration compressors, steam condensate systems, autoclave sterilizers).

Typical Use Cases

Refrigeration & HVAC Systems: Monitoring suction (vacuum) and discharge (positive) pressure across refrigeration compressors and condensing units in a single compound gauge per circuit.
Steam Condensate Systems: Compound measurement on steam traps, condensate return lines, and flash tanks that cycle between vacuum and positive steam pressure.
Vacuum Distillation: Monitoring process vacuum depth and the transition to positive inert gas pressure during product discharge in pharmaceutical and chemical plants.
Autoclave Sterilizers: Combined vacuum (air removal) and steam pressure monitoring during pre-vacuum and sterilization phases of autoclave cycles.
Water & Wastewater Pumping: Compound gauges on pump suction (vacuum/negative) and discharge (positive) to detect pump cavitation and monitor system performance simultaneously.

Competitive Benefits

Cost Reduction: One compound gauge replaces two instruments (one vacuum gauge + one pressure gauge), reducing procurement cost, installation labor, and the number of process penetrations required.
Complete Process View: A single glance at the compound dial reveals the full pressure state of the system — whether in vacuum, at atmospheric pressure, or under positive pressure — without switching between two adjacent gauges.
Color-Coded Dial Clarity: Standard compound dials use contrasting colors (typically red for vacuum, black for positive) to clearly distinguish the two measurement ranges and prevent misreading the pointer position.
Wide Range Versatility: Standard compound ranges from −1 to +3 bar up to −1 to +15 bar cover the majority of refrigeration, steam, and process applications from a single product family with minimal SKU proliferation.
Vacuum Pull-Down Monitoring: Accurately indicates the degree of vacuum achieved during evacuation procedures — essential for refrigeration system commissioning and leak-test verification where a specific vacuum depth must be confirmed before charging with refrigerant.

Payment and Shipping Details

We accept T/T, L/C at sight, and Western Union for international orders. Standard shipping terms are FOB Shanghai/Ningbo or EXW Wuxi. Standard compound ranges (−1 to 0 to 5, 9, and 15 bar) in DN100 are available for dispatch within 5–7 working days from stock. Less common ranges, stainless steel wetted options, and liquid-filled versions require 10–15 working days. All compound gauges are tested at both the vacuum end and the positive pressure end of the scale before shipment to verify compound range accuracy.

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Vacuum & Compound Pressure Gauge (-1 to 0 to 15 bar) Manufacturers

Wuxi Huihua Special Instrumentation Co., Ltd. was established in December 2001, the registered capital is 5 million yuan, the existing staff of more than 50 small and medium-sized joint-stock enterprises.
The company specialises in the production of various types of special instruments, alternative to the localisation of imported instruments.To seismic pressure gauge, seismic electric contact pressure gauge, stainless steel pressure gauge, diaphragm corrosion-resistant pressure gauge, marine pressure gauge and other series as the main products. On the basis of field instruments, we have developed various kinds of pressure transmitters, pressure controllers, digital pressure gauges and so on. There are more than 30 series and 3000 specifications. Products are widely used in petroleum, chemical, paper, metallurgy, mining, chemical fibre, electric power, food, environmental protection, rubber and plastic, hydraulics and many other industries, and more than 2,000 domestic customers to establish a friendly relationship with the national large and medium-sized enterprises to establish a good partnership, won the majority of users praise, and set up a corporate brand image.