Cronos GPS Current Interrupter

• Rugged M. C. Miller Co. design, highly reliable, easy to operate and very competitively-priced.
• Precision clock-timing even with an intermittent view of the GPS satellites.
• Two years of continuous (current interruption) operation on a single set of replaceable "D" cell batteries - no need to recharge the unit every few days
• Easy to program via a PC or can "quick select" via the keypad
• Available in 100A relay (external relay) and 40A relay (internal relay) models. Both relays are rated at 120V AC/DC
• Solid-state (non-polarity dependent) relay - no unit orientation or polarity concerns
• Only 1mV dropped across the relay per Amp - both small and large currents can be interrupted
• Fully-automated current-interruption programs can be started in the field with the push of a single button.

Specifications

Maximum Current:
100 Amps at 120V (12,000 watts) external relay
40 Amps at 120V (4,800 watts) internal relay

Maximum Working Voltage:
170V DC (either polarity), 120Vrms (50/60Hz).

Voltage Drop:
1mV per Amp Suitable for interrupting low Voltage bonds and anodes.

Overload Protection:
75kW(10/100µs); 500kW(8/20µs) 1.2kA peak @ clamp voltage. Auto thermal shutdown at 105^oC.

Isolation to ground:
2,000 Volts

Setup Options:

• On/Off 0.1 to 99 sec. 0.1 sec increments
• Start and stop date and time
• Begin cycle with relay open or closed
• Close relay at end of work day
• Start cycle at beginning of work day
• Switching offsets ±500ms (both On-to-Off and Off-to-On) – allows for use of other relay types.

Power Consumption:

• Runs on 2 "D" Cell batteries (3.6V, 19A/Hr)
• Battery-life depends on programmable settings - 2 years continuous operation typical on default settings.

Time Standards:
UTC (default) or GPS; Synchronization @ 00.00 (default) or @ start time; Local –Offset; user defined to ensure consistency

Clock/Interruption Accuracy:

• 1ms max. deviation with satellites in view
• 0.5 ms per hour without satellites in view
• Reacquires precision time when satellites return to view

Temperature compensated range:
-40^oC to +85^oC.

Temperature Range:

• Relay Operation: -40^oC to +85°C
• LCD Operation: -20^oC to +70°C

Multiple Unit Programming:
Cronos PC software allows personal settings to be created and saved for future download to Cronos units, or a "master" Cronos unit can be used to automatically program other Cronos units.

Size/Weight:

• 40A Model: 9"L, 11"W, 6"D (15.4 lbs)
• 100A Model:
  Control Unit: 9"L, 11"W, 3"D (5.6 lbs)
  Relay Unit: 13.5"L, 7"W, 4"D (19.4 lbs)

Ships with the following:

• 6 feet of ultra flexible #2 cable
• Windows setup software
• PC to Cronos RS-232 cable