Preface
Model PM880 Portable Hygrometer User’s Manual iii
Information Paragraphs
• Note paragraphs provide information that provides a deeper understanding of 
the situation, but is not essential to the proper completion of the instructions.
• Important paragraphs provide information that emphasizes instructions that 
are essential to proper setup of the equipment. Failure to follow these 
instructions carefully may cause unreliable performance.
• Caution! paragraphs provide information that alerts the operator to a hazardous 
situation that can cause damage to property or equipment.
• Warning! paragraphs provide information that alerts the operator to a 
hazardous situation that can cause injury to personnel. Cautionary information 
is also included, when applicable.
Safety Issues
WARNING! It is the responsibility of the user to make sure all local, county, 
state and national codes, regulations, rules and laws related to 
safety and safe operating conditions are met for each 
installation.
Auxiliary Equipment
Local Safety Standards
The user must make sure that he operates all auxiliary equipment in accordance 
with local codes, standards, regulations, or laws applicable to safety.
Working Area
WARNING! Auxiliary equipment may have both manual and automatic 
modes of operation. As equipment can move suddenly and 
without warning, do not enter the work cell of this equipment 
during automatic operation, and do not enter the work 
envelope of this equipment during manual operation. If you do, 
serious injury can result.
WARNING! Make sure that power to the auxiliary equipment is turned OFF 
and locked out before you perform maintenance procedures on 
the equipment.