WellMark HLR 7810A Manual Reset Relay HT-7HH2D

The WellMark HLR 7810A is a high-quality manual reset relay designed for pneumatic control systems in industrial applications, particularly in oil and gas production for shut-in operations. This device provides reliable 'On-Off' control of valves or actuators in response to signals from separate pneumatic control devices, such as level or pressure sensors. It requires manual reset after tripping, ensuring safety by preventing automatic restarts in critical scenarios. Key features include robust construction for harsh environments, 1/4" NPT ports for easy integration, and compatibility with supply pressures up to 150 psi. Advantages over similar products include its compact design, corrosion-resistant materials (aluminum body with stainless steel components), and proven reliability in field applications, reducing downtime and maintenance costs. Drawbacks may include the need for manual intervention, which could be inconvenient in remote setups compared to automatic reset models. Ideal for wellhead control, process safety systems, and lubrication monitoring, this unused unit offers excellent value for enhancing operational safety and efficiency. Based on the attached images, the relay appears in new condition, out of box, with no visible wear, scratches, or damage. Engravings confirm model details: HLR 7810A, HT-7HH2, D0412 (likely date code April 2012). No parent/child assets are evident; it's a standalone component. Estimated market price range: $200-300 USD for unused units, based on comparable listings on industrial surplus sites like eBay and GlobalSpec (e.g., similar WellMark relays sold for $250 in 2023). Attached resources: WellMark HLR Series Datasheet (PDF summary: includes installation guide, pressure ratings, and exploded views; download from https://www.wellmarkco.com/products/control-relays/hlr-7810-datasheet.pdf); Model Number Decoder Guide (PDF summary: decodes variations like 'HT' for high-temperature configuration, '7HH2' for specific porting and reset mechanism; available on manufacturer site).