A. Product Overview

The I-Therm XTM Series is a range of industrial digital preset timers designed for applications where equipment needs to start, stop or change its operating state after a predefined time interval.

The series is available in three panel sizes:

• XTM-443: 48 x 48 mm front size
• XTM-773: 72 x 72 mm front size
• XTM-993: 96 x 96 mm front size

These models use a 3-digit single-row 7-segment LED display and provide timing indication in hours, minutes and seconds.

The XTM Series provides several configurable timing ranges:

• 9.99 seconds with 0.01 second resolution
• 99.9 seconds with 0.1 second resolution
• 999 seconds with 1 second resolution
• 99.9 minutes with 0.1 minute resolution
• 999 minutes with 1 minute resolution
• 9 hours 59 minutes with 1 minute resolution
• 99.9 hours with 0.1 hour resolution
• 999 hours with 1 hour resolution

The timing range is selected through DIP switches.

Key XTM Series features include:

• Programmable up and down counting
• Timing range from 9.99 seconds to 999 hours
• ON Delay and OFF Delay timer modes
• Setpoint setting through thumbwheel switches
• Two outputs
• Relay or SSR drive output options
• Power On Start
• Front Start
• Remote pulse start
• Remote pulse and level start
• Front and rear terminal reset options
• Universal 90 to 270 VAC supply
• 24 VDC supply available on request
• 0.05 percent full-scale timing accuracy
• 0.01 percent repeat accuracy

The official datasheet specifically notes that memory backup is unavailable on the XTM Series.

B. Working Principle

The I-Therm XTM Series Digital Timer works by comparing elapsed time with a preset timing value.

First, the required timer range is selected using the DIP switches. The required time is then set through the thumbwheel switches on the timer.

The timer can operate in two main modes:

ON Delay Mode

When the timer receives its start command, timing begins. After the preset time has elapsed, the configured output changes state.

This mode is useful when a device must be switched ON only after a predetermined delay.

OFF Delay Mode

In OFF Delay operation, the output timing sequence is configured so that switching takes place according to the preset delay requirement after the triggering condition.

This is useful where equipment must continue operating for a defined period before switching OFF.

The ON Delay and OFF Delay mode selection is made using the timer's DIP switch configuration.

Timer Starting

The XTM Series supports multiple start methods:

• Power On Start
• Front Start
• Remote Pulse High to Low
• Remote Pulse and Level Close

This allows the timer to be integrated with manual switches, sensors, control circuits and industrial automation systems.

External Inputs

The timer can accept start signals from:

• PNP proximity switches
• NPN proximity switches
• Potential-free contacts
• 3 to 30 VDC pulse signals

Reset can be performed using the front key, rear terminals or through power-related configuration.

C. Why Is the XTM Series Digital Timer Used?

The official datasheet specifies the timer functions rather than listing individual industries. Based on those functions, the XTM Series is suitable wherever an industrial process requires automatic operation after a preset time interval.

A digital preset timer can reduce dependence on manual timing and provide repeatable time-controlled machine operation.

Typical requirements include:

• Delaying machine startup
• Delaying equipment shutdown
• Controlling process duration
• Switching heaters after a preset period
• Controlling motors and pumps based on time
• Creating timed machine sequences
• Operating alarms after a delay
• Controlling contactors and relays
• Automating repetitive manufacturing operations
• Providing end-of-cycle signals
• Timing filling, mixing, heating or processing operations

Because the XTM Series covers seconds, minutes and hours, it can handle both short-duration and long-duration timing applications.

D. Suitable Buyers

The I-Therm datasheet does not specify buyer categories directly. Based on its panel mounting, industrial inputs, relay and SSR outputs and timing functions, suitable buyers would typically include:

• Industrial automation companies
• Control panel manufacturers
• Machine manufacturers
• Original Equipment Manufacturers
• System integrators
• Electrical panel builders
• Automation engineers
• Electrical contractors
• Factory maintenance departments
• Production and process engineering teams
• Machinery manufacturers
• Industrial equipment suppliers
• Process automation companies

The XTM Series is particularly relevant for buyers who need a simple and reliable preset timer for ON Delay, OFF Delay or time-controlled switching applications.

Frequently Asked Questions

1. What is the I-Therm XTM Series Timer?

The I-Therm XTM Series is an industrial digital preset timer range designed for time-based control applications. The series includes XTM-443, XTM-773 and XTM-993 models.

2. Which models are available in the XTM Series?

The XTM Series includes:

• XTM-443
• XTM-773
• XTM-993

These models mainly provide different panel sizes.

3. What is the difference between XTM-443, XTM-773 and XTM-993?

The main difference is their physical size.

XTM-443 is approximately 48 x 48 mm at the front.

XTM-773 is approximately 72 x 72 mm.

XTM-993 is approximately 96 x 96 mm.

4. What is the timing range of the XTM Series?

The timer supports ranges from 9.99 seconds to 999 hours.

5. Can the XTM Timer work in seconds, minutes and hours?

Yes. The available ranges include seconds, minutes and hours.

6. Does the XTM Series support ON Delay timing?

Yes. ON Delay is one of the selectable timer modes.

7. Does the XTM Series support OFF Delay?

Yes. The timer can also be configured for OFF Delay operation.

8. Can the XTM Timer count upward and downward?

Yes. The XTM Series supports programmable up and down counting.

9. How is the timer range selected?

The required time range is selected through DIP switches.

10. How is the preset time entered?

The XTM Series uses thumbwheel switches for setting the timer setpoint.

11. How many outputs does the XTM Series have?

The XTM Series provides two outputs.

12. What output options are available?

Relay and SSR drive outputs are available. The output configuration is factory set according to the selected order code.

13. What is the relay rating?

The relay output specification is 5 A at 250 VAC or 30 VDC.

14. What is the SSR drive output?

The SSR drive specification is 12 VDC at 30 mA.

15. What supply voltage does the XTM Series require?

The standard supply voltage is 90 to 270 VAC. A 24 VDC version is available on request.

16. Can the timer start automatically when power is switched on?

Yes. Power On Start is supported.

17. Can the XTM Timer be started remotely?

Yes. Remote pulse and remote pulse with level start options are supported.

18. Can proximity sensors be connected to the XTM Timer?

Yes. The control input supports PNP and NPN proximity switches, potential-free contacts and 3 to 30 VDC pulse signals.

19. Does the XTM Series have memory backup?

No. The official XTM Series datasheet states that memory backup is unavailable.

20. What is the accuracy of the XTM Series Timer?

The stated accuracy is 0.05 percent of full scale, with 0.01 percent repeat accuracy.