Masterclock NTP Digital Clocks
CLKNTD12-DF
CLKNTD12-DF - Double-faced variant of CLKNTD12, for side-wall mount. 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-DF was the double-faced version of the CLKNTD12, designed for flag-mount installation where both sides of the clock are visible (typically in a corridor or meeting-room passageway). This model has been retired. For new double-faced NTP installations Daylight bv recommends the double-faced variants in the NTDS range (such as the NTDS46-DF), which support more sizes and colours.
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 15.2 cm (12.5 x 6 in)
- Weight: 5 kg
- Black powder-coated steel chassis
- Polycarbonate lens
- Ceiling/wall mount bracket provided
- Double-faced configuration
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-DF still available?
No, retired. For double-faced NTP displays you can choose from the DF variants in the NTDS range (NTDS24-DF, NTDS26-DF, NTDS44-DF, NTDS46-DF, etc.), which are digital-only and available in multiple sizes and colours.
What is a logical replacement that keeps the analogue-digital feel?
A combination of two CLDNTD12 units mounted back-to-back provides the same effect; alternatively, choose a pure digital DF display if the analogue dial is no longer a requirement. Request advice before ordering.
What if my existing CLKNTD12-DF is still working?
A working unit can stay in service as long as it synchronises. For repair or replacement Daylight bv can perform a diagnosis and advise on the best route. Contact us if you experience problems.
Why order from Daylight bv rather than directly from Masterclock?
Daylight bv has been the authorised Masterclock distributor since 2014. You get invoicing in EUR with Belgian VAT, local support in Dutch, French or English, on-site service by prior arrangement and no complications with customs or US imports.