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  • A photograph of a 20900-a mano-watch™ mercury-free vacuum controller/monitor.
  • Diagram of how a 20900-a mano-watch™ mercury-free vacuum controller/monitor should be setup.

Mano-Watch™ Mercury-Free Vacuum Controller/Monitor

Item #: 20900-A

Normal Availability: Discontinued; no replacement available

Product Description

This product was discontinued by the manufacturer in October 2019. It is no longer available and we do not currently have a replacement product for it.  If you need parts, they may or may not still be available.  Please contact us by email if you have any such inquiries.

The rack-mountable Mano-Watch™ uses a solid state controller to maintain a set pressure for vacuum distillations without the need for a mercury manometer. This unit features a 4-digit LED display with 3 LEDS to indicate process value displayed, alarm activated, and output power on. Alarm settings include high, low and deviation modes. Connections for the sensor and vacuum solenoid control are right in the front, as well as the power and alarm switches.

The solid-state capacitive vacuum sensor (shown here but SOLD SEPARATELY as item #20090-B) is detachable via a quick, self-sealing, make/break connector (no cord twisting required) for remote installation from the controller or for quick replacement. The sensor connects to your system via a 1/4-18 NPT 316 L SS fitting.

The electric output on the front right goes to a 120 V solenoid assembly (SOLD SEPARATELY as item #20900-C) which controls the vacuum source as shown in the schematic diagram to the left.

If you want the complete system, you must order all three components.

The load rating is 1,200 watts resistive, the sensor is accurate to +1% full scale, and the instrument works in the 1 to 760 mm Hg range. Control box weight: 8 lb (3.6 kg), dimensions 4" h x 5.75" w x 6.5" d (10 x 14.6 x 16.5 cm).

Other Details

Manufactured in: USA

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