National Time & Signal Corporation

The MC3 Master Clock is a cost effective yet powerful master clock. The MC3 comes standard with three solid state 120VAC outputs to directly control clock circuits without the need for additional relays. These solid state outputs are capable of driving up to 3 amps each (7 amps combined) and incorporate zero-cross technology to handle undesirable current surges and inrush. The MC3 uses the power-line frequency to keep accurate time eliminating the inaccuracies of crystal oscillators found in other products. The MC3 can be equipped with a GPS antenna (order separately as MC3-GPS) to keep time with the National Institute of Standards and Technology NIST satellite time base accurate to one second over a million years. The web enabled version (WeMC3) can be ordered providing PC browser based configuration and programming as well as NIST or computer network time synchronization. The MC3 and secondary clocks combine to create a maintenance-free time system automatically synchronizing the clocks and adjusting for daylight savings and power outages. When there is a power loss, the MC3 can keep time internally for over 150 days without the need for batteries or expensive rechargeable battery packs. The MC3 can correct the complete line of National Time & Signal clocks as well as synchronous clock systems by other manufacturers. The MC3 can even transmit National’s On-demand Instant Reset over the existing clock system wiring without affecting the existing clocks. The MC3 will also synchronize time with a sound system, paging system, phone system, media retrieval system or an existing master clock which can provide a synchronizing output. This universal system synchronization is easy with an optically isolated input capable of receiving synchronization pulses of 17-132VAC from other sources. The synchronization pulses can be a simple contact closure at 12:00 or one of many common clock reset formats using National's Automatic Protocol Detection algorithm. A serial port is also available to communicate time information with other equipment.

National Time’s 400 Series Architectural clocks lead the industry in durability and value. Our clocks are supplied completely assembled ready to be installed into rough openings to alleviate job-site costs, aggravation, and hassle. No more mounting and wiring individual lighting ballasts and clock mechanisms and on-site design of reflective back plates. A tempered glass crystal housed in an aluminum frame protects your choice of dial and hands. Select one of our popular styles or design your own to match your facade. The aluminum hands are driven by the industry’s most powerful worm-driven gear train mechanism which can be automatically corrected for power outages and daylight savings adjustments using one of National’s Master Clocks.

National Time precision built square clocks are designed and manufactured especially for the sign industry. They are offered in versatile sizes ranging from 18" up to 72". Square cabinets are fabricated from extruded aluminum and come completely assembled, with or without illumination, including white translucent dials and standard black numerals for exceptional durability and very low maintenance. Standard choices are Modern, Arabic, or Roman dials, however other styles can be manufactured. The interior of 200 Series cabinet is accessible through a hinged front dial section. Clocks feature the reliable standard National outdoor movements and hands, complete with a #970 remote reset panel or optional Master Clock.

NATIONAL TIME combines accuracy and reliability of solid state design with meticulous craftsmanship to produce analog thermometer movements you can count on. Our electronic dial thermometer is a state-of-the-art microprocessor based control with accuracy of +- ½° C over its entire range. A proprietary temperature sensor minimizes unnecessary “temperature searching”, resulting in extended bearing and motor life. Standard movements display temperature ranges of -20 to 120°F or -40 to 100°F (-30 to 50° C or -40 to 40°C) over an angular graduated dial of 280° (288° on Celsius models). 300 Series can support dial sizes up to 48" diameter. The universal sensor enclosure design facilitates side or bottom mounting. A 15’ cable is supplied. Consult factory for two-way thermometers and special installations.

National Time’s wired clock systems have been the backbone of daily operations in K-12, Higher Education, Hospital and Industrial facilities for over seven decades. They remain the number one synchronized clock solution due to their extended service life and nominal cost of operation.

National Times largest series clock mechanisms. Welded plate steel housings are CNC bored for precise shaft alignment and smooth operation required for clocks this size. These mechanisms support hands for dial sizes to 50' in diameter and also utilizes our reliable heavy duty worm worm gear drive technology. In addition, all shaft bearing surfaces are outfitted with enclosed ball bearings. Hands can be advanced with continuous drive advancement or impulsed each minute depending on the end users preference. Both are achieved with the use of a 115VAC 50Hz or 60Hz synchronous high torque gear motor. This series unit can be outfitted with collector rings to power neon transformers located on each hand allowing neon outlining. Hands are balanced for the additional weight of the transformers and the neon is provided locally.

The National Time 4MR series clock mechanisms employ wormworm gear drive technology to provide smooth and continuous advancement of the hands. In addition, this technology protects the clock mechanism from natures harshest elements such as wind shear, snow and ice. The 4MR series cast aluminum gear housing design also serves as a perpetual lubrication reservoir as well as the tough backbone of the mechanism. This mechanism is driven by a permanent magnet, 115V 50Hz or 60Hz synchronous gear motor. The 4MR series mechanisms offer mounting options to suit all applications with dial sizes to 11' in diameter. Custom shaft lengths can be provided to meet specific project requirements. Remote manual switch or automatic clock controls are used for resetting the units to the correct time following power outages or daylight savings adjustments. 4MR mechanisms are compatible for synchronization with the NIST atomic clock when used with the MC100-GPS or MC100-LAN interface options.

The National Time 3MR series clock mechanisms employ wormworm gear drive technology to provide smooth and continuous advancement of the hands. In addition, this technology protects the clock mechanism from nature's harshest elements such as wind shear, snow and ice. The standard mechanism is driven by a permanent magnet, 115V 50Hz or 60Hz synchronous gear motor. The 3MR series mechanisms offer mounting options to suit all applications with dial sizes to 48" diameter. Custom shaft lengths can be provided to meet specific project requirements. Remote manual switch or automatic clock controls are used for resetting the units to the correct time following power outages or daylight savings adjustments. 3MR series mechanisms are compatible for synchronization with the NIST atomic clock when used with the MC100-GPS or MC100- LAN options.

The National Time 2M 2MR series clock mechanisms are economical yet employ worm worm gear drive technology similar to its bigger cousins providing smooth and continuous advancement of the hands. The standard mechanism is driven by a permanent magnet, 115V 50Hz or 60Hz synchronous gear motor. These mechanisms offer mounting options to suit all applications with dial sizes to 42" diameter. Custom shaft lengths can be provided to meet specific project requirements. Either can be set manually by turning the minute hand without damaging the unit. Access to the hands is required to set the time on the 2M series mechanism while the 2MR series incorporates dual motors and the ability to be reset remotely with multiple reset options.

The MC100WP is a microprocessor based clock and auxiliary circuit controller capable of synchronizing both digital and analog secondary clocks. The MC100WP provides automatic corrections for power outages as well as programmed events such as daylight savings. Powered by a 120VAC supply, the MC100 utilizes a 10 year lithium battery for backup during power outages. A user-selectable time base allows the master clock to either monitor the power line frequency, internal crystal oscillator as well as an optional GPS or LAN interface to provide the most accurate time keeping. The MC100WP comes standard with four circuits which may be used as either clock circuits or auxiliary circuits for tones, bells, and other timed events. Each circuit has an indicating LED and an OFFAUTORESET slide switch for ease of manual control. Programming is easy utilizing a backlit 32 character liquid crystal display and a 16 button keypad. The multifunction keypad provides single button menu access allowing quick and easy time, schedule, and setup changes. Two level password security may be used to protect technician level settings and programmed events. The MC100WP supports three program schedules with up to 200 program entries. Each event duration is programmable from 1 second to over 4 days. Attractive neutral Powder Gray finish with Night Blue graphic overlay complete with label pockets for custom circuit legends.