PROMASTER

TECHNOLOGY

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The Technology of PROMASTER

PROMASTER is a watch for
professionals
who challenge their
limits.
That’s why it always features
the most up-to-date technologies.
Functionality, durability and safety.
Behind them all are
CITIZEN’s cutting-edge technologies.

PERFORMANCE

PROMASTER embodies the spirit of innovation. It inspires people to push boundaries.

10,000 metres: Higher than any mountain on Earth Altimeter and compass

PROMASTER’s altimeter can measure from minus 300 metres to 10,000 metres above sea level—higher than any mountain on Earth! Once activated, the altimeter continuously measures your altitude for five minutes, then provides automatic readings every three minutes over the next 12 hours, freeing climbers to focus on climbing without the need to perform any fiddly manual operations.
With all the information displayed in analogue rather than digital format, there is no need to switch away from the all-important time display to check altitude or orientation.

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Keeps running even on wind-ravaged mountaintops Cold proof to minus 20°C

When you’re exposed to a raging wind on the summit of a mountain, you can experience unimaginable levels of cold. But however severe the conditions, climbers need access to time and altitude information.
For PROMASTER, we recreated an ultra-cold environment in which to conduct a barrage of verification tests. We successfully demonstrated that the watch, altimeter and compass all continue working even at minus 20°C. This is a professional sports watch you can rely even in harsh, cold regions.

Display depth even in time display mode Depth meter

In 1985 we introduced the world’s first diver’s watch with a depth meter using an electronic sensor. The PROMASTER depth meter has only continued to evolve since. The water pressure sensor (at the 3 o’clock position on the case) only needs to be in contact with water for two seconds before it automatically starts measuring water depth to a maximum of 70 metres.
The depth meter starts from 3 o’clock (i.e. 3 o’clock = 0 metres) and gradually “descends” from there. Depth, which is indicated on the markers, rises in increments of ± 1 metre in the more common 0 to 40 metre range, then changes to increments of ± 2 metres for the less common 40 to 70 metre range, making for excellent readability. (You also get to enjoy the sight of the hands moving dynamically during your dive.) It is also possible to display the time, while displaying current depth and maximum depth. By eliminating the hassle of switching between modes, we enable divers to have both hands free at all times during dives.

Eco-Drive and an altimeter and a depth meter? It’s thanks to CITIZEN’s unique IC technology

Eco-Drive features an ultra-low-power microcomputer that controls the depth meter and the altimeter. Activate either of them and the microcomputer analyses the information from the sensor, converts it into depth or altitude data, then rotates the hands to communicate the relevant information to the user. In addition, the microcomputer, controls the watch and checks the battery voltage, the amount of energy being generated, and the temperature. While we deliberately use a CPU with a low clock speed, the real reason it can perform so many processes simultaneously is because of the expertise CITIZEN has developed in reducing Eco-Drive’s power consumption over the years.

Eco-Drive and an altimeter and a depth meter? It’s thanks to CITIZEN’s unique IC technology

Eco-Drive features an ultra-low-power microcomputer that controls the depth meter and the altimeter. Activate either of them and the microcomputer analyses the information from the sensor, converts it into depth or altitude data, then rotates the hands to communicate the relevant information to the user. In addition, the microcomputer, controls the watch and checks the battery voltage, the amount of energy being generated, and the temperature. While we deliberately use a CPU with a low clock speed, the real reason it can perform so many processes simultaneously is because of the expertise CITIZEN has developed in reducing Eco-Drive’s power consumption over the years.

Time signal reception in 3 seconds, anywhere on Earth Satellite Wave GPS

Satellite Wave GPS receives position data and a time signal from orbiting GPS satellites which it uses to automatically adjust the time and date. When receiving only a time signal, Satellite Wave GPS requires a minimum of 3 seconds to get the correct time—the fastest reception time in the world.* As long as there is open sky above your head, wherever you are on Earth, Satellite Wave GPS will keep telling the precise time. * As of February 2017, for a multifunctional light-powered GPS satellite-synchronised watch, according to research by Citizen Watch Co., Ltd.

Switch between two time zones in an instant Dual time display function

Just pull out the crown and point the second hand at one of the cities on the bezel to display the time and date there instantly. The watch simultaneously displays two preset times, ‘home time’ and ‘local time,’ which you can switch between with an intuitive one-step operation.

Fast and powerful: High-speed twin-coil motor

The high-performance motor has the capacity to move the hands extremely rapidly both clockwise and anti-clockwise. The sheer speed at which users can switch between ‘local time’ and ‘home time,’ as well as other time zones, makes stress a thing of the past.

TOUGHNESS

PROMASTER’s toughness gives you the confidence to take on new challenges.

Lightweight. Rust resistant. Scratch resistant. Super Titanium™

Light, kind to the skin and resistant to rust, titanium has excellent natural properties. At the same time, though, its softness and viscosity make it very hard to process. Through processing technologies developed over decades, CITIZEN can create beautiful mirror finishes and clean and sharp edges. And by applying our proprietary surface-hardening technology, Duratect, we created Super Titanium™, a material over five times harder than stainless steel. Super Titanium™ resists nicks and scratches even in the harsh environments experienced by divers and climbers. Uniquely for PROMASTER, we developed models that combine two technologies—Duratect MRK and Duratect DLC—for our toughest exteriors yet.

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Gas hardening:Duratect MRK

Duratect MRK is a technology that maintains titanium’s original properties of lightness and rust-resistance while hardening the surface of the material itself (as opposed to applying a coating to it). Two gases are injected into a special vacuum furnace and heat treatment applied to produce a hard layer about 20 to 30 microns thick on the surface of the titanium. Resistance to nicks is increased because the surface of the titanium material itself is made harder. Whether you’re hefting compressed air tanks out at sea or clambering up rocky mountain summits, Super Titanium™ will protect your watch from all the shocks that harsh environments bring.

Cold plasma coating:Duratect DLC

Duratect DLC is a cold plasma technology. It involves passing an electric current through hydrogen and carbon gases to diffuse an amorphous carbon coating onto the surface of the titanium. DLC is an acronym for ‘diamond-like carbon.’ The DLC coating has an amorphous structure containing carbon and hydrogen (like a diamond) and lacking any grain boundaries. As a result, it’s extremely hard, smooth and scratch-resistant.
CITIZEN’s Duratect DLC also has a higher level of adhesiveness than standard DLC technologies—something that makes for enhanced levels of toughness.

Keeping the hands in position #1 Shock counteraction function

Whether you’re at sea, on land or up in the sky, any obstacle-rich environment comes with the risk of bumping your PROMASTER and knocking the hands out of place. CITIZEN developed its proprietary shock counteraction function to address that problem. The instant your watch experiences a shock or strong vibration, an electrical signal is sent to the motor, momentarily locking the rotor to prevent the hands from moving out of place. The whole operation takes just one-thousandth of a second, meaning that the watch has prevented any deviation and resumed telling the right time before you’ve even noticed the impact!
At CITIZEN, we recognise that the basic function of a watch is above all to always display the correct time. That’s why we make repeated tests using hammers and sophisticated measuring devices to verify this particular function. (We have developed a unique mechanism to make sure the function only activated when the shock passes a certain threshold.) A professional sports watch must display the correct time regardless of extreme conditions. That’s why the shock counteraction function is so valuable.

Shock counteraction function How it works
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Keeping the hands in position #2 Automatic hand correction function

This function goes into action in the unlikely event of the hands deviating from the correct time. It checks the position of the hands at regular intervals, and automatically returns the hands to the correct position in the event of any error. Combining this function with the shock counteraction function means that your watch maintains its accuracy even in environments where exposure to shocks and bumps is high.

SAFETY

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Elevated quality and safety levels make PROMASTER the ideal partner for people who challenge their limits.

For high visibility in total darkness Luminous hands and dial

PROMASTER’s photo-luminescent markings absorb light fast, stay bright for a long time and cover a generous proportion of the hands. Furthermore, we deep-sea tested different colours for the dial and hands to find the colour combination that offers the best possible underwater visibility. With this design, you can be confident that your watch is fully readable even in the ocean’s darkest depths.

No accidental rotation. Enhanced water resistance Screwdown crown

A screwdown crown helps makes PROMASTER fully water resistant. Because the stem of the crown is threaded, it can be screwed tightly into place when not in use. Locking the crown doesn’t just mean better water resistance, it also guards against unintentional rotation.

Guarding against accidental rotation Unidirectional bezel

We made the bezel of the PROMASTER unidirectional in line with the ISO standard for diving watches. This improves safety by eliminating the danger of a diver accidentally turning the bezel the wrong way during a dive. The Eco-Drive Professional Diver 1000m model is equipped with a bezel-locking mechanism.

Stopping your watch slipping off your wrist Double-folding buckle

Using a double-folding buckle means that hard-working professionals can concentrate on the task in hand without having to worry about their watch accidentally slipping off. It’s the most basic safety measure of all.

Eco-Drive

CITIZEN’s light-power technology is driving PROMASTER’s evolution.

No need to replace batteries. Eco-Drive light-powered technology.

All PROMASTER watches are powered by light, a source of energy that is accessible anywhere on Earth. It is Eco-Drive, CITIZEN’s proprietary light-powered technology, that makes this possible. Eco-Drive generates energy to drive the watch even from dim light and stores the surplus in a rechargeable cell. On a single full charge, it can run for up to six months in total darkness,* eliminating the need to replace or recharge batteries.
We have worked to reduce Eco-Drive’s energy consumption so that sophisticated functions like the depth meter and altimeter can run alongside the core time-keeping function. Eco-Drive continues to evolve, opening up exciting new possibilities for PROMASTER.
*Some models run for less than six months.

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No need to replace batteries. Eco-Drive light-powered technology.

All PROMASTER watches are powered by light, a source of energy that is accessible anywhere on Earth. It is Eco-Drive, CITIZEN’s proprietary light-powered technology, that makes this possible. Eco-Drive generates energy to drive the watch even from dim light and stores the surplus in a rechargeable cell. On a single full charge, it can run for up to six months in total darkness,* eliminating the need to replace or recharge batteries.
We have worked to reduce Eco-Drive’s energy consumption so that sophisticated functions like the depth meter and altimeter can run alongside the core time-keeping function. Eco-Drive continues to evolve, opening up exciting new possibilities for PROMASTER.
*Some models run for less than six months.

PRODUCT