Masterclock NTP Digital Clocks
CLKNTD18
CLKNTD18 - Analog hands + digital NTP display, 18-inch large format. 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 CLKNTD18 was the largest version in the retired CLKNTD range: an 18-inch analogue-digital NTP clock for large spaces such as atriums, production halls or station foyers. For new installations on this scale, Daylight bv recommends the larger sizes from the NTDS range (NTDS84/NTDS86 with 18 cm digits), optionally combined with a CLDNTD12 if the analogue component remains an aesthetic requirement.
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: 45.7 x 6.35 cm (18 x 2.5 in)
- Weight: 5.1 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 CLKNTD18 still available?
No, retired. There is no direct one-to-one replacement in the same 18-inch analogue-digital format. For large spaces we direct customers towards the NTDS84/NTDS86 range (18 cm digits, pure digital).
What is a good alternative for visibility at distance?
For visibility at 50+ metres, the NTDS84 (18 cm digits, 4-digit) or NTDS86 (18 cm digits, 6-digit) is the right choice. Both support multiple LED colours and synchronise on NTP.
Can I combine two CLDNTD12 units as a visual reference?
For smaller spaces that is an option, but for the visibility that the CLKNTD18 provided, a larger format (NTDS84/86) is typically required. Request advice based on your exact room and viewing distance.
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.