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Alarm Trip 1-out-of-2 Voting with High Availability

Alarm Trip 1-out-of-2 Voting with High Availability
A customer has a Safety Instrumented Function they need to implement with two independent level transmitters (radar), each wired to a separate STA Functional Safety Trip Alarm. The process will trip if either level reaches the set point, for example a 1 out of 2 (1oo2) voting. However, if the alarm trip (STA) detects an input or unit fault. The customer did not want the process to trip. Instead they wanted to take the faulty unit out of service leaving the process running with the one good level and alarm trip. 
Published: November 28, 2017

SPA2IS: Programmable Limit Alarm Trips with Intrinsically-Safe Field Connections

SPA2IS: Programmable Limit Alarm Trips with Intrinsically-Safe Field Connections
Programmable Limit Alarm Trips with Intrinsically-Safe Field Connections for Current and Voltage; RTD and Thermocouple (4-Wire).
Published: November 2, 2017

EHELP: Are the STA and SPA2 process alarm relays configurable as Failsafe?

EHELP: Are the STA and SPA2 process alarm relays configurable as Failsafe?
Q: For the STA 4-Wire SIL 2 and SIL 3 Compliant Programmable Current/Voltage and RTD/Thermocouple Safety Trip Alarms, can the process alarm relays be configured as Failsafe?  Can the process relay output of the SPA2-TRPRG be configured Failsafe?
Published: September 14, 2017

E-HELP: Adjustable Deadband Thermocouple Alarms

E-HELP: Adjustable Deadband Thermocouple Alarms
Q: We currently are using TCA Thermocouple Alarm units in our plant (model TCA/K-10MV/SX1/117AC/[STD]). The user’s manual says that the deadband is fixed at 1% of the input range. However, we need the TCA to trip at a set point of 190°F and reset at 180°F. Is this model capable of meeting this requirement and do you still manufacture this model?
Published: August 16, 2017

CPA: PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips

CPA: PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips
PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips
Published: August 3, 2017
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