The top-mounted SRD991 digital positioner is integral with the Type 766 actuator, spring opposed diaphragm actuator designed specifically to fit the Research Control Valve body-bonnet assembly. The unique positioner is compatible for both the 1/4 in. and 1/2 in. actuator. The unit functions as an air-to-open actuator retracting the stem and opening the valve on an increasing instrument signal. This solution should be used when the application calls for high positioning accuracy or when greater force is required over the standard actuator such as in the case of high shutoff pressures or excess packing friction. This linear connection creates a quicker and more accurate control element. The SRD991 top-mount positioner is available with a large amount of benefits including a LCD screen, protocols and diagnostics. All the diagnostics features can be easily configured and displayed by the Positioner DTM. Moreover, the Positioner DTM enables a complete health report of the valve with all data of configuration and diagnostics. The simple installation and setup of the SRD991 positioner allows an easy upgrade to any BLRA pneumatic positioner.
|Base current||10.5 mA ± 0.5 mA + FISCO FDE (Fault Disconnection Electronic)|
|Air Supply||1.4…6 bar (20…90 psig)|
|Range||8…260 mm (0.3…10.2 in.) with standard lever|
|Protection Class||IP 65 (IP 66 on request), NEMA 4X|
|Electrical Connection||M20 x 1.5 or 1/2-14 NPT (others, with Adapter AD)|
|Weight||1.7 kg (3.7 lb); Double acting: 2 kg (4.4 lb)|