3
11041781.04 01/2020 EN/DE
Pressure gauge with reed contact model 851-A, for Ex areas
EN
Content
Declarations of conformity can be found online at www.wika.com
1. General information 4
2. Design and function 5
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Description. . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . 6
3. Safety 7
3.1 Explanation of symbols . . . . . . . . . . . . . . . . . . 7
3.2 Intended use. . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Improper use. . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Responsibility of the operator . . . . . . . . . . . . . . 9
3.5 Personnel qualification . . . . . . . . . . . . . . . . . .10
3.6 Skilled personnel . . . . . . . . . . . . . . . . . . . . . 10
3.7 Labelling, safety marks . . . . . . . . . . . . . . . . . . 11
3.8 Ex marking . . . . . . . . . . . . . . . . . . . . . . . . .12
3.9 Specifications and temperature limits . . . . . . . . . . 12
3.10 Special conditions for safe use (X conditions) . . . . . 14
4. Transport, packaging and storage 15
4.1 Transport . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.2 Packaging and storage . . . . . . . . . . . . . . . . . . 15
5. Commissioning, operation 16
5.1 Mechanical connection . . . . . . . . . . . . . . . . . . 17
5.2 Electrical connection . . . . . . . . . . . . . . . . . . . 23
5.3 Contact protection measures. . . . . . . . . . . . . . .25
5.4 Commissioning . . . . . . . . . . . . . . . . . . . . . . 26
6. Faults 26
7. Maintenance and cleaning 29
7.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . .29
7.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8. Dismounting, return and disposal 31
8.1 Dismounting . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9. Specications 34
Annex: EU declaration of conformity 71
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