Dry Running Protection for NEMOLAST® Stators
The dry running protection units (STP2A, STP2D, STP3) continuously monitor the surface temperature of the stator during operation. If the operating temperature rises over a predetermined set point, due to an increase in friction caused by dry running, a signal is sent to the motor control unit and the pump shuts down. This prevents any damage to stator and rotor. The controller can be set for two different switch-off temperatures. The first set temperature would be for the normally pumped product. The second temperature can be set for a different substance temperature, for example, during a cleaning process.
Flow Sensing Unit for Solid Stators
The flow sensing unit is used to protect a pump fitted with a solid stator against dry running. The unit is installed in close proximity to the pump itself, either in the suction or in the discharge pipework. If flow drops below a certain level, indicating a dry running condition, a signal is sent to the motor control unit and the pump shuts down, thus preventing any damage.
Speed Monitoring Device
Some processes require monitoring of the rotational speed of the pump. When this is necessary, NETZSCH can supply impulse switches mounted to the drive unit. The shaft can be fitted with one or more contacts to measure the required number of impulses per revolution. These units can be fitted to both block construction and bearing housing pump designs and are supplied securely mounted to the pedestal or the bearing block.
Diaphragm Pressure Gauge, G3/4 Inch Connection
A pressure gauge which is isolated from the process fluid by a stainless steel diaphragm is available. The G 3/4-inch gauge is designed for use with substances with low to medium viscosity. This gauge can be combined with a switch to automatically shut off the pump when the maximum allowable pressure is exceeded; this cut-out pressure is adjustable.
Diaphragm Pressure Gauge with DN50/PN40 or 2” ANSI B16.5 330 lbs. Flanged Connection
This pressure gauge differs from the G 3/4-inch by means of the DN50 open measuring flange. The large nominal width of the measuring flange provides protection against overpressure even for highly viscous and clogging substances.
Pressure Control Device DTSL 3
The operating pressure is displayed by a Bourdon gauge that is securely isolated from the process fluid by means of an elastic diaphragm. The pump shuts down automatically when the maximum allowable pressure is exceeded; this cut-out pressure is adjustable. The Pressure Control Device can be supplied with a differential pressure on/off switch.
Multi-Function Pressure Instrument
Along with a display indicating the current operating pressure of the pump, this easy-to-install unit allows you to set additional points for alarm or emergency shut-down due to overpressure.
A shaft seal quench pot flushed with fluids can prevent dry running of the shaft seal ring. Quench pots can also prevent pumped product from crystallizing due to contact with the atmosphere.
The Permanent Lubricator supports the sealing function of the shaft seal. It can be used for packed glands as well as mechanical seals fitted with an additional quench ring. The Permanent Lubricator keeps grease in the grease chamber ring or quench pot under pressure by means of a pre-stressed spring. A shut-off device on the lubricator can be activated to accommodate periods when the pump is idle.
Pressurized Flushing for Double Mechanical Seal Systems
Back-to-back mechanical seals require a sealing water supply unit for correct operation and the sealing pressure must be must be at least 29 psi / 2 bar above the prevailing pressure in the suction housing. A pressure and flow monitoring system is mounted onto the pump to control the volume of flow in the seal chamber.
Gear Joint Filling Unit
Gear joints require lubricating oil for operation and that oil is specified in the NETZSCH Operating and Maintenance Manual. A Gear Joint Filling Unit which includes a an oil container, pump unit and hoses, is a quick and easy way to completely fill the gear joint.
Ring Dosing Nozzle
When conveying high viscosity media, we recommend you install a ring dosing nozzle to reduce pressure loss in the pipeline. This nozzle fits directly behind the pressure joint of the pump and, depending on the lubricant introduced through the nozzle, the discharge pressure can be reduced by up to 70% as a result of frictional loss. This option can significantly lower investment and operating costs.
To fix pump baseplates to the ground securely, we recommend the use of our anchor bolts. A two-component adhesive is used to secure the anchor to the floor. After a short curing time, the anchor is fixed to the ground, allowing subsequent mounting of the baseplate and the pump.
Stator Removal Tool
This tool aids in the removal and mounting of stators. For pump sizes up to NM 045, we recommend the use of our strap wrench. For the pump sizes from NM 053 upward, our chain wrench is recommended.
To protect floor surfaces, machine feet can be mounted directly to the baseplate for pump installation. Flooring is not damaged as it would be with an anchor bolt system. After installation, there are no crevices or hollows for the accumulation of bacteria and the floor is more easily accessed for cleaning. The stainless steel threaded spindle of each foot adjusts to irregularities in the floor surface.
When your application requires a mobile pump, we can supply a sturdy cart assembly.
Covers for Drive Monitors
Covers can be supplied in a range of stainless steel materials to protect the drive unit against spraying and condensation. They can be provided to protect against hot drives, the open environment, as a shield for the rotating drive shaft of the pump or simply for aesthetics.