What is Off-delay timers?
Off-delay timers are vital constituents of many electrical and electronic systems. They generate a controlled pause before the switching-off process after removing the input signal. Thus, various types of off-delay timers exist for different applications with their requirements. These different types will enable you to pick the best timer for your needs.
Types of Off-Delay Timers
This article briefly discusses off-delay timers by looking at their various kinds.
Analog Off Delay Timers
Analog off-delay timers, the pioneers in the field, are the most ancient type of timers. They utilize mechanical or electromechanical parts to induce the delay. Let’s delve into their fascinating history:
- Mechanical Timers: Gears and springs are used in this timing mechanism. When the input signal is removed, this spring unrolls slowly, causing a lag. Mechanical clocks are quite straightforward but not as accurate as electronic ones.
- Electromechanical Timers: When made, these combine electricity and mechanics. They have an electric motor that drives a mechanical timing.
Mechanism When the input signal is removed, power ceases to run through this motor. At the same time, mechanical components continue functioning within a certain period, which is defined as delaying it for some time.
Digital Off-Delay Timers
A delay-off-timer is a digital method of controlling timing. Compared to their analog counterparts, they are superior in accuracy and flexibility. Presented below are some regular types:
- Microcontroller-Based Timers: These timers rely on a microcontroller for control of time delay. This allows for different modes of operation according to the specific preset functions. They are used in situations where there must be great precision.
- Solid-State Timers: Such timers employ solid-state electronic devices such as transistors and integrated circuits to control the duration of delay. They have no moving parts, which would normally wear out or break down easily, hence increasing their efficiency and reliability. Solid-state timers are common in industrial automation and control systems.
Programmable Off-Delay Timers
Programmable off-delay timers give advanced functions and adaptability. They can quickly meet specific requirements when configured accordingly. Below are two main types:
- PLC-Based Timers: Programmable Logic Controllers (PLCs) can be programmed for timer functions, including off–delay logic operations. They are highly portable because they can be used in more complex industrial control systems than other types of devices with this capability. They also allow integration with computer networks when necessary. Like many other timer-based devices, they consist of an input section, memory, or timer element that uses an electric power source.
- Multifunction Timers: Among ‘off delay’ types, multifunction timers exist whose modes may include the same mode except for the off delay mode itself. For instance, it could take one day to program these digitally using button keypads or even analog pendulum clocks with pointer hands. Some examples of multifunction timers include 3 second-to-5 minute 12-volt units made by ESI Electronics Inc., 2 second-to-30 hour 120 VAC motoring relays made by Crouzet USA Inc., and 2 second-to-5 minute electromechanical timers made by Potter & Brumfield.
Pneumatic Off Delay Timers
Pneumatic off-delay timers utilize compressed air to control their timing functions. They come in handy where electronic timers cannot be used, for example, in an explosive or corrosive environment. Let’s look at how they work:
- Air Reservoir Timers: This type of timer is an off-delay timer, and the time delay of the circuit is controlled by using an air reservoir. After the input signal is eliminated, there will always be a gradual release of air out of the needle valve through the reservoir, which causes delay. The pneumatic timers are solidly built so that they can withstand harsh conditions.
Hydraulic Off Delay Timers
Hydraulic off-delay timers work like pneumatic ones. They are used in demanding applications requiring high strength and durability. Let’s see how it works:
- Fluid Reservoir Timer: These off-delay timers use a hydraulic fluid reservoir with a flow control valve to create a time delay. Fluid movement through the valve after removing input signals results in delayed action of this type. Hydraulic timers in industrial machinery and equipment require accurate timing and high resistance.
Relay Off Delay Timer
These timers use relays to control the timing function. They are very reliable. Let’s see how it works:
- Electromechanical Relays: These use electromagnetic relays to control the delay. After the input signal is removed, it will remain active for a set delay period before switching off. Relays are used in timers, basic control circuits, and automation systems.
Conclusion
Different kinds of off-delay timers exist and are meant for use in other applications and environments. Whether you require a primary mechanical timer or one that is complex with digital features, there is an off-delay timer that will suit your needs. In order for it to work properly and efficiently, studying these types of off-timers will help you in picking a timer that is appropriate for your needs.
When many timers are being used, the simpler and more reliable option is analog timers; otherwise, digital ones could be more precise. Other timers like pneumatic or hydraulic should be used in rough conditions, while programming ones are very adaptable. Relay timers are highly preferred by most automation systems for basic operations. In electrical and electronic systems, one can achieve excellent performance and efficiency by choosing a suitable off-delay timer.
At E Control Devices, you will find a variety of off-delay timers to meet any need. If you need an analog timer, digital timer, programmable one, pneumatics or hydraulics timing devices, among others, we have got you covered. Find out more about our products and select from our wide range of off-delay timers on our website.
