Hansen self-alarming relief valve technology named POP-EYE.
This innovative technology provides positive indication (bright, flashing LED) when a relief valve lifts and as such eliminates subjectivity and personnel hazard in trying to identify the valve that lifted. To learn more, please find additional information and a video at the website http://www.hantech.com/popeye
Part numbers:
Standard Capacity valves: H5600A H56001 H5602 H5613 H5604
Reduced Capacity valves: H5600R H5602R H5632R H5633R H5634R
Standard pressure settings: 150*,175, 200, 225, 250*, 275, 300*, 325, 350 psig. 400 psig (28 bar g) available for all models except H5601 and H5602. (*Stock pressure settings.) Custom pressure settings in psig, bar, or kPa are available upon request. Minimum pressure setting is 150 psig. For halocarbon systems, rupture disc assemblies are required; see below.
Electratherm 4400 machine requires a H5600R/150E-P [150psi set point]