FAQs in Process Alarm Equipment
Questions
- Are the Annunciators suitable for use in harsh environments?
- What do you use as a signal supply voltage with your annunciator range?
- What voltage does the Annunciator operate on?
Answers
Are the Annunciators suitable for use in harsh environments?
RTK/ MTL annunciators are provided with optical isolation for all of the control inputs as standard. (signal & pushbutton inputs). They are are fully EMC compliant. A high percentage of our annunciators have been in service for many years in harsh environments including offshore platforms, petrochemical plants, nuclear plants, power stations and sub-stations.
What do you use as a signal supply voltage with your annunciator range?
Our annunciator range use a +24VDC signal supply voltage as standard. This is provided via a fused spur within the annunciator and distributed to customer terminals for use as a signal wetting voltage. As an option RTK can supply inputs suitable for use with externally powered 24V, 48V, 125V or 250V signals but the signal supply is provided externally by others.
What voltage does the Annunciator operate on?
Our annunciator range uses 24VDC as a logic voltage.
On P725 annunciators external power supplies are used when the customer has other supply voltages available – typically 120VAC, 240VAC, 125VDC.
On 725B annunciators external or optional internal power supplies are used when the customer has other supply voltages available – typically 120VAC, 240VAC, 125VDC.
As an option Redundant Power Supplies are available