Masterclock NTP Digital Clocks
CLKNTD12
CLKNTD12 - Analog hands + digital NTP display, 12-inch square. End-of-life model.
LEGACY · END OF LIFE
This model is no longer in production. We recommend as modern alternative:
View the alternative: CLDNTD12 →For special sizes or double-faced variants, please contact us for a custom configuration.
The CLKNTD12 was the 12-inch square analogue-digital NTP clock from Masterclock, with a classic dial plus digital NTP display. This model has been retired and is replaced by the CLDNTD12 (square) or CLDRNTD12 (round) with identical functionality and an updated electronics revision. For existing customers with CLKNTD12 installations, Daylight bv can provide a replacement strategy and compatibility advice.
Standard Features
- Syncs to any NTP source for accurate, traceable time
- Complete flexibility in Daylight Saving Time configurations
- Uses standard Ethernet wiring
- Fully configurable via supplied WinDiscovery software
- Front indicator light provides synchronization status
- Microprocessor-controlled stepper motor with sweeping second hand for quiet operation
- Battery-backed real-time clock chip in case of loss of synchronization or power
Network Compatibility
- Supports DHCPv4 and DHCPv6 for automatic network address, name servers, and time-server configuration
- Internet protocols: TELNET or SSH, SNMP
- IPv4/IPv6 compatible
Configuration
- Configure devices via supplied WinDiscovery software or TELNET or SSH
- Configuration saved to non-volatile memory and survives power losses
- Authenticated network messages prevent unauthorized tampering of clock configuration
Power
- 90-265 VAC, 50/60 Hz
- IEC AC power connector and cord included
- PoE (Power over Ethernet) option available
Holdover Accuracy
- On loss of power, device reverts to an internal battery-backed real-time clock chip with accuracy of approximately 1 minute per year or under 165 ms per day
Connectors
- Ethernet RJ45
- IEC 320 AC input
- USB port for configuration
Physical
- Size: 31.8 x 6.35 cm (12.5 x 2.5 in)
- Weight: 3.5 kg
- Black powder-coated steel chassis
- Polycarbonate lens
- Wall mount bracket provided
Operating Parameters
- Temperature: 0 to 60 °C
- Humidity: up to 90% (non-condensing)
Optional
- 12/24-hour face
- 24-hour face
- Face plate illumination
- Stainless steel case
Warranty
- 5-year limited parts and labor warranty
Compliance
- FCC, CE, RoHS, ANSI
Frequently asked questions
Is the CLKNTD12 still available?
No, this model has been retired. The replacements are the CLDNTD12 (square) and CLDRNTD12 (round). For existing installations we provide tailored replacement advice.
What is a logical replacement?
The CLDNTD12 (same square format) or CLDRNTD12 (round variant). Both synchronise on NTP and offer the same analogue-digital display. Wall-mount fit may differ slightly; request advice when replacing an existing installation.
Can Daylight bv still repair my existing CLKNTD12?
For retired models, spare-parts availability and repair time are limited. Contact Daylight bv for a diagnosis; in many cases a replacement with a current model is more cost-effective than a repair.
Do I keep my 5-year warranty if I replace?
A newly purchased CLDNTD12/CLDRNTD12 receives a fresh full 5-year limited warranty via Daylight bv from the delivery date of the new unit.