Upgrade An Outdated Lathem Clock System

Replace a Lathem controller or signaling device. Repair or replace secondary analog clocks on the system.

Are you maintaining a Lathem synchronized time system? You might as well make some enhancements along the way. Take advantage of over 40 years experience in manufacturing and servicing many different types of clocks. Get straightforward advice from one of our team members with no obligation.

SCHEDULE A CLOCK SYSTEM CONSULTATION >

Replacing Your Clock

In recent years, mechanical movements used to repair or replace traditional Lathem clocks have become obsolete. We still offer some clocks with mechanical movements, such as impulse clocks, but in most cases we recommend upgrading to current clock technology. Lathem built a few different types of clocks. To find out which kind you have, look for the original model number on the back of the clock. If the clock is synchronous wired (SS prefix), identify the voltage. If the clock is minute impulse (ISC prefix), specify whether 2- or 3-wire.

Back of Lathem 3-wire synchronous clock, showing mechanical movement

Compatibility

Lathem brand analog clocks are described by a prefix followed by a 6- or 7-digit model number

SS (Synchronous Wired Secondary) may also be preceded by (24)
NAT – Similar to SS clock, compatible with National Time System
ISC (Minute Impulse Secondary Clock) specify 2- or 3-wire and if 12 hour correction is desired

The remaining digits in the model number describe the clock size, shape, mounting application, case and lens material.

Find A Replacement

Once you’ve identified your clock model, try our Replacement Clock Finder or call 800.328.8996 for model number assistance.

REPLACEMENT CLOCK FINDER >

AllSync Plus Wired Clocks

The 3-wire movement (SS Series) is the most common type used with Lathem synchronous clocks and is compatible with ALLSYNC PLUS technology. AllSync Plus clocks are available in 120VAC and 24VAC, so be sure to select the correct voltage for your replacement clock.

Precision, Energy Efficiency and Flexibility with Lifetime Technical Support

AllSync Plus clocks are available in many more styles than their counterparts. When replacing Simplex 9200 Series clocks, the choice of case material and style is up to you!

Plug-n-play Molex Connection
Accurate to within one second of the system controller
15 minutes of continued operation during power outages
3-Year warranty

SHOP ALLSYNC PLUS >

Update to AllSync IQ

If you’re struggling with an outdated Lathem program timer, contact us to find out how easy it can be to replace it with AllSync IQ. This scheduling device provides synchronized control of wired secondary clocks, bells and other electrical circuits. Programming is fast and easy using the Remote Connect web interface or keypad.

Control up to 99 schedules and 9999 events
Automatic adjustments for daylight saving time and leap year
Six signal circuits and two clock circuits
Surge protection
5-Year warranty

schedule a clock system consultation >

Repair Your Existing Clocks with a Replacement Movement Kit for Lathem Clocks

Perfect for the DIY expert, this AllSync Plus kit has everything you need to replace the mechanical movement on your Lathem brand clock! Watch our easy-to-follow video to walk you through each step, or download the instructions to get your old Lathem clocks ticking again!

ORDER THE KIT >

ASKIT01 for Lathem Clocks

There were two or three clocks on my workbench at all times.

Even just to repair a clock, the guts aren’t cheap and sometimes it would take me an hour to fix it.
Now, maintenance has gone down to about nothing.“

TONY D.

– Building and Grounds Director

Replacements for Lathem Impulse Clocks

Impulse clocks are distinguishable by not operating a sweep hand. Maintain your existing clock system with direct replacements for Lathem ISC Series impulse clocks.

picture showing 2-wire impulse clock movement on back of clock

Select the correct type.

Impulse clocks come in 2- and 3-wire models and with hourly only or hourly and 12-hour correction.

Look for the two-letter code in the model number when selecting a replacement clock for your Simplex system:

[FF] 2-wire, hourly correction

[FG] 2-wire, hourly and 12-hour correction

[JF] 3-wire, hourly correction

[JG] 3-wire, hourly and 12-hour correction

shop impulse clocks >

Upgrade your wired system today.
Transition to wireless for tomorrow.

You may just need a replacement clock or some repair kits to keep your wired system running today. But, there is another way.

By switching to a hybrid wired/wireless controller, you can prepare for tomorrow. WIRELESS SYSTEMS give you the flexibility to add any number of clocks. Hang them wherever you need them without the expense of wiring another circuit.

Need advice? Talk to an expert.

From maintaining to upgrading, we can help you through each consideration.