CHENGDU ZHENGHUA ELECTRONIC INSTRUMENT CO.,LTD.
Add.: No. 22, Shuanglin Road, Chengdu, China 
Tel: 008628-84313964  84310256  84313309
Fax: 008628-84326136
Post Code: 610066
Http://max.book118.com
E-mail: zhvacuum@ymax.book118.com
Micro-computer Digit-display Compound Vacuum Gauge
User’s Manual
Table of Contents
1. Safety Instruction…………………………………………………1
2. Technical Parameters……………………………………………..2 
3. Operating Principle……………………………………………….3  
4. Performance Overview……………………………………………4
5. Usage Introduction………………………………………………..5
6. Overview of Gauge Performance………………………………….7 
7. Appearance and Installation of Gauge…………………………….10 
8. Vacuum Gauge and Gauge Wiring Diagram………………………12
9. Starting Up and Display of Vacuum Gauge……………………….13
10. Usage of Vacuum Gauge…………………………………………13 
10.1. Usage of Resistance Unit………………………………………13 
10.2 Usage of Ionization Unit………………………………………..15  
11. Degassing By Vacuum Gauge……………………………………16
*12. Control Function and Setting Method…………………….17
*13. Control Output……………………………………………18
*14. Expanded Function……………………………………….20 
                 Cabinet Specification………………………….22
15. Appendix      Gauge Interface ……………………………….24
                 FAQ …………………………………………..27 
Note: Contents with *mark refer to the specification of selected performance and should be regarded as useful if only the function array is selected. 
1. Safety Instruction
In order to ensure the vacuum gauge to have normal function, high precision, stability and service life, please operate and use the instrument according to the allowable value and applicable condition indicated in the Manual. 
·When operating, maintaining and repairing the vacuum gauge, please follow the safety standard for the Electrical Equipment. 
·DO NOT start the ionization gauge under atmospheric pressure, for that will burn the filament of the ionization gauge. 
·DO NOT disassemble the gauge where the vacuum system or tube is in the vacuum state. 
·DO NOT apply a normal gauge to the “positive pressure” vacuum system other than the gauge that as designed for the “positive pressure” circumstance. 
·Protect corrosive gas in the vacuum system from invading the sensing wire of the resistance gauge and electrodes of ionization gauge so as to extend the service life of the gauges. 
·Adopt positive measures to prevent erroneous operation or damage. 
·We won’t bear any liabilities arising from any failure to correctly execute the Manual, and the warranty we offered for the vacuum gauge and its components should also be regarded as void and null at the same time. 
Declaration of Marks Herein: 
Means something MUST be followed and any failure to follow it may result in injury for people and damage to the instrument. 
Means important additional information and skill or advice. 
2. Technical Parameters 
2.1 Technical Parameters of Resistance Unit
·Model number of selected gauge: ZJ-52T resistance gauge 
·Resistance of resistance gauge sensing wire in cold state: (86.5Ω±1.7Ω)
ZDF-III使用说明书(27)客户版0927全english.doc