DT9100 Intrinsically Safe Digital Clock

Product features

  • HH : MM display
  • 25.4 mm character height
  • ±1 minute accuracy per year
  • Local or remote synchronisation
  • 2 isolated alarm output
  • Easy on-site configuration
  • Battery powered or 4-20 mA loop powered versions
  • Intrinsically safe (zone 1, 2)
  • IP 65 protected

The battery is included in the price, additional batteries can be ordered if necessary!

Type designation

DT9100 intrinsically safe digital clocks type designation

Product description

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.

Technical specifications

Safety data:
The connection terminals of the supply voltages are isolated from each other, the isolation is in compliance with the standard EN 61010-1, taking into consideration the following:
Pollution level:2
Measurement category:II
Intrinsical safety data:
Certificate:BKI 18 ATEX 0007 X
Protection marking:DT9100 B
II (1) 2G Ex ia IIC T5 (-20 °C < Ta < +60 °C)
DT9100 I4
II (1) 2G Ex ia IIC T6 (-20 °C < Ta < +60 °C)
Display:4 digit LCD, 25.4 mm character height
Time display:HH : MM
Range:00:00 - 23:59
Error:±1 min. / year @ 0 °C < Ta < 40 °C (typically)
Display refreshing time:1 sec.
Output parameters:
Output:2 digital outputs
Output type:optically isolated passive switching transistor
Load rating:10 V, 16 mA max. (Ex safety data!)
Manual control:
Manual control:3 push-buttons on the front cover
Power supply:
Power supply:Intrinsically Safe 4-20 mA loop-powered (DT9100 I4)
Intrinsically Safe 4.5 V battery pack (DT9100 B)
Maximum back-up time:60 min.
Ambient conditions:
Operating temperature range:-20 - +60 °C
Relative humidity:90% (max., non-condensing)
Place of installation:potentially explosive area (zone 1, zone 2), safe area
Electromagnetic compatibility (EMC) accordance
with the standard EN 61326
Immunity:industrial area
Noise emission:Group 1, Class B
General data:
Housing:moulded polycarbonate
case, installable as a field or panel instrument
Connection:IP 65 cable entry,
push-in direct connections
Connection cable:0.25-1.5 mm2
Dimensions:field instrument: 167 × 111 × 71 mm (width × height × depth)
panel instrument: 167 × 87 × 95 mm (width × height × depth)
Weight:0.5 kg
Protection:IP 65
Detailed information see in operating instructions. The Manufacturer maintains the right to change the technical data!


Leaflet of productOperating Instruction (DT9100 B)Operating Instruction (DT9100 I4)ATEX certificate

Application examples

DT9100-B intrinsically safe digital clocks application example

DT9100-I4 intrinsically safe digital clocks application example


Type selection and ordering

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