The DT9100 … 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 DT9100 B version.
- Remote synchronisation through control the 4-20 mA current loop at DT9100 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 (DT9100 B) and intrinsically safe 4-20 mA loop powered (DT9100 I4).
The DT9100 … is housed in a moulded polycarbonate case which is dust-tight and houseproof to IP 65 to allow for installation in the field or on the control panel.
The internal intrinsically safe battery will power the DT9100 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.