The DT9102 … Intrinsically Safe Digital Clock will accurately display local time in the hazardous area.
The clock incorporate a very high accuracy crystal oscillator that ensures less than 1 minute error per year (typically) at ambient temperature between 0-40 °C. Large 4 digit, 25.4 mm height liquid crystal display make the time visible at a distance.
Three different synchronisations mode are selectable in the user menu:
- Remote synchronisation through an intrinsically safe digital input at DT9102 B version.
- Remote synchronisation through control the 4-20 mA current loop at DT9102 I4 version: 4-10 mA current range is the normal operation mode and 14-20 mA current range is the synchronisation mode.
- Local synchronisation through the front panel push buttons.
The clocks has 2 isolated digital outputs, which can be used for alarm signalling.
The functional parameters can be set by the front panel push-buttons, through a simple menu system: time setting, synchronisation modes, time display mode, alarm output setting, etc. The settings are protected by a two-level password against unauthorised manipulation.
The instruments has two power supply versions: battery powered (DT9102 B) and intrinsically safe 4-20 mA loop
powered (DT9102 I4).
The DT9102 … is housed in a DIN standard 144 × 72 mm ABS case with IP 65 protection from the front and IP 30 protection from the back side, for installation on the control panel.
The internal intrinsically safe battery will power the DT9102 B clock continuously for at least three years. Replacement battery units are available (BAT). At 20 °C replacement batteries only lose about one percent of their charge each year, so it is practical to stock a spare on-site. By replacing the battery or by switch off the 4-20 mA loop the clock save the time for 60 minutes.