Abstract: A torque monitoring apparatus includes a Make-Up Tong (10) and a Break-Out Tong (12). The Make-Up Tong (10) is connected to one side of a threaded connection and the Break-Out Tong (12) is connected to the other side of the connection. A chain (22) attached to a winch (24) is operable to activate the Make-Up Tong (10) to torque the connection. A snub line (28) attached to the distal end of the Break-Out Tong (12) restrains movement thereof. A load cell (30) disposed in series with the snub line (28) measures the restraining force thereof. The angular position between the snub line (28) and the Break-Out Tong (12) is maintained constant such that the moment arm utilized for a torque calculation is constant. Therefore, the linear force is directly proportional to the torque and adjustment for angular deviations is not required.

Abstract: A density sensor includes a stationary housing (12) and a reciprocating body (22) with a float (26) attached thereto to provide a buoyant force. The reciprocating body (22) is connected to a piston (32) by a reciprocating rod (34). The piston (32) is operable to move within a bore (30). A second piston (52) is also disposed in the bore (30) and is coupled to the piston (32) by a spring (54). A transducer (44) is disposed at the other end of the bore and is connected to the piston (52) through hydraulic fluid disposed in a hydraulic chamber (56). The spring (54) is functional to remove low frequency components of acceleration from the buoyant force and the hydraulic fluid disposed in the hydraulic chamber (56) is operable to remove high frequency acceleration components from the buoyant force. In this manner, the transducer (44) can be isolated from both high and low frequency acceleration components.