ISA 12.13-1 : 1995

1. Scope
2. Purpose
3. Definitions
4. General Requirements
5. Construction
5.1 General
5.2 Meters and Indicators
5.3 Alarm or Output Function
5.4 Trouble Signals
5.5 Controls and Adjustments
5.6 Batteries
6. Marking and documentation
6.1 General
6.2 Marking on Instruments
6.3 Instruction Manual
7. Performance Tests
7.1 General
7.2 Sequence
7.3 Preparation of Instrument
7.4 Conditions for Test and Test Area
7.5 Selectable Gas/Range Instruments
7.6 Unpowered Preconditioning Storage
7.7 Drop test
7.8 Vibration
7.9 Calibration
7.10 Accuracy
7.11 Temperature Variation
7.12 Step Change Response to 100 Percent Calibration Gas
7.13 Humidity Variation
7.14 Air Velocity Variation
7.15 Supply Voltage Variation
7.16 Electromagnetic Interference (EMI)
7.17 Long-Term Stability
7.18 Flooding with Undiluted Gas
7.19 Dielectric Strength
Annexes
A. References
B. Explanatory Notes

Deals with details of construction, performance and testing of portable, mobile and stationary electrical instruments used for sensing the presence of combustible vapor or gas concentrations in ambient air. Parts of these instruments can be installed or operated in Class l hazardous (classified) locations and gaseous mines according to codes and standards defined by authorities with jurisdiction. Covers line-voltage operated instruments rated at 600V nominal or lower, and portable, mobile or stationary instruments using a non-rechargeable (primary) type battery or rechargeable (secondary) type.