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Features

35 amp AC/DC interrupter

Crystal controlled timing indicators

Rechargeable battery

Immediate or delayed interrupting operation

Low battery indicator

Countdown and relay status

On and off cycle times up to 999.9 seconds

Synchronized operation with any number of PR-1s and PR-2s

General Information

MCMs Model PR-1 Current Interrupter is a computer age successor to the Model PR-30. The use of a microprocessor and crystal controlled timing result in a unit which can operate alone or in precise synchronization with any number of other PR-1s or the 100 amp Model PR-2. This feature facilitates measurement of instant-off polarized potentials. The PR-1 is also well suited for use where more traditional current interrupter applications are required.

Specifications

Display: 5-1/2-digit liquid crystal with battery and relay condition annunciators.

Character height: 0.5 in.

Operating temperature: -20 to +195ºF. (-30 to +90ºC.)

Time Base: 2 MHz Temperature Compensated Crystal Oscillator, 0.5 Sec. per 24 Hr.

Keyboard Type: Sealed, Tactile feedback

Key Arrangement: 16 keys: 5 function keys (Time Set, Start Set, Stop Set (6), On cycle, Off cycle), 10 digit keys, 1, Enter Key

Cycle Range: 0.2 to 999.9 seconds, On Cycle and Off Cycle.

Auto Start: Start Set: Programmable delayed Start from 1 minute to 24 hours, in one-minute increments.

Auto Stop: Stop Set (6). Programmable Stop from 1 minute to 24 hours, in one-minute increments. NOTE: Always stops with respect to the Start Relay switch position (Open or Closed).

Synchronization: Multiple unit capability, compatible with all JR versions.

Accuracy: Less than ± 0.5 sec. in 24 hours (one day).

Relay: Latching relay with spare contacts.

Maximum Ratings, Current: 35A @ 28VDC, 35A @ 125VAC

Maximum Ratings, Voltage: 28 DC @ 35 A, 240VAC @ 5A

Battery Type: Sealed, rechargeable, 6 Volt, 2.6A/H Charger supplied.

Battery Life: Approx. 50 hrs. @ 0.4 sec ON and 1.6 sec OFF.

Size: 10" H x 10.75” W x 5” D (26 x 28 x 13 cm)

Weight: 7bs (3.2 Kg)

Night Latch: The PR-1 supports 24-hour timing and a scheduled relay closure period. For example, a night latch time of 1700 could be entered from the keypad, and a start time of 0700. The unit will operate normally until 1700, at which time the relay will close and will stay latched until 0700 the next morning, when the normal interrupt cycle will begin again. This feature facilitates full CP polarization during hours when the survey crews are absent.