Hansen Technologies Vari-Level™ Adjustable Level Control. Model: LB5. S/N: MR 663. The Hansen Vari-Level provides excellent level control and monitoring flexibility for industrial and large commercial refrigeration systems. It takes the place of multiple single point level switches on new or existing refrigerant vessels. While primarily designed for Ammonia, R22, R134a, and other approved refrigerants, this control is also suitable for other approved liquids. Comes with a 4–20 mA output module: MOD420. Power requirements: 115V, 50/60Hz. Overall dimensions: 6 in. L x 8 in. W x 1 ft. 6 in. H.