Abstract: A headwear-mountable situational awareness unit is disclosed. The unit includes a thermal imaging camera rotatably connected to a mounting portion, the mounting portion connectable to a front portion of protective headgear. The unit further includes a heads-up display pivotally connected to the mounting portion, the heads-up display portion arranged to pivot between a mounted position and a handheld position and configured to display information captured by the thermal imaging camera.

Abstract: A marking device is disclosed. The marking device includes a marker housing. The marker housing includes an attachment portion configured to pivotally attach the marker housing to a pole. The marker housing also includes a translucent portion formed around at least a portion of the housing. The marker housing also includes an environmental seal. The marking device includes an electrical light positioned within the marker housing and oriented toward the translucent portion, and a programmable circuit configured to activate the electrical light in one or more marking flashing patterns. The environmental seal protects the electrical light and programmable circuit from external environmental conditions. Optionally, the device can clip to a marker such as a flag to indicate the existence of a hazardous condition.

Abstract: A fault indicator for indicating the occurrence of a fault in an electrical conductor has a housing, a high capacity battery, at least one light emitting diode (LED) visible from the exterior of the fault indicator upon the occurrence of a fault and which may be automatically reset to a non-fault indicating position a predetermined time after the occurrence of the fault, and electronic circuitry for sensing a fault, for actuating the LEDs to indicate a fault and for resetting the LEDs to a non-fault indicating condition a predetermined time after the fault has occurred. The electronic circuitry conserves energy by drawing insubstantial current from the high capacity battery during non-fault conditions. The electronic circuitry may also include in-rush restraint to avoid false tripping of the fault indicator during surges. An inrush restraint circuit has an output signal that is logically combined with a fault indicator signal to disable the fault indicator during inrush conditions.

Abstract: A fault indicator for indicating the occurrence of a fault in an electrical conductor has a housing, a high capacity battery, a plurality of emitting diodes (LEDs) visible from the exterior of the fault indicator upon the occurrence of a fault, and electronic circuitry for sensing a fault, for actuating the LEDs to indicate a fault and to provide a timed reset of the LEDs to a non-fault indicating condition a predetermined time after the fault has occurred. The electronic circuitry, including a microprocessor that is normally in a sleep mode, conserves energy by drawing insubstantial current from a high capacity battery during non-fault conditions. Preferably, the microprocessor controls activation of the fault indicating LEDs with pulse width modulated (PWM) signals during defined time intervals for improved visibility. Visibility is further improved where the PWM signals for the indicator LEDs are interleaved in time to provide a highly distinctive flicker effect.

Abstract: A fault indicator for indicating the occurrence of a fault in an electrical conductor has a housing, a high capacity battery, a permanent fault display for indicating the occurrence of a permanent fault, a temporary fault display for indicating the occurrence of a temporary fault, a current sensor for sensing the load current in a monitored conductor, a microcontroller for determining when a fault condition occurs and for activating the permanent or temporary fault displays. Preferably, each display includes one or more LEDs. Upon detecting a fault, the microcontroller begins flashing the permanent fault LEDs. After a predetermined interval, the microcontroller again senses the load current. If the current is zero, the fault is permanent and the permanent LEDs continue to flash until a timed reset occurs. If the load current is present, the fault is temporary and the temporary LED is flashed until the timed reset.

Abstract: A fault indicator for indicating the occurrence of a fault in an electrical conductor is reset at a predetermined time after the fault is detected, such as about 4 hours. The fault indicator has a housing, a high capacity battery, a fault sensor, a display for indicating a fault condition, and a programmable controller with a sleep state that draws low quiescent current. As a result the battery is expected to last the lifetime of the fault indicator. The fault indicator may optionally include current inrush restraint and/or voltage inrush restraint to inhibit the controller from activating the display to the fault indicating condition during the inrush conditions. The electromagnetic field about the conductor causes an electrostatic sensor to develop a differential voltage signal between two electrodes of different areas for the voltage inrush restraint circuit. Auxiliary contacts are provided to remotely monitor the fault indicator.

Abstract: A fault indicator for monitoring an electrical conductor has a housing, an indicator flag or a light emitting diode (LED) that becomes visible from the exterior of the fault indicator upon the occurrence of a fault, and electronic circuitry for sensing a fault, for actuating the indicator flag or LED to a fault indicating condition and for resetting the indicator flag or LED to a non-fault indicating condition a predetermined time after the fault has occurred. An overload indicator provides an overload indication, such as a fast flash rate, for a predetermined time when an overload threshold is exceeded, and provides a different overload indication, such as a slow flash rate, for a predetermined time when the line current in the monitored conductor falls below the threshold.

Abstract: A fault indicator for indicating the occurrence of a fault in an electrical conductor has a housing, a high capacity battery, at least one light emitting diode (LED) visible from the exterior of the fault indicator upon the occurrence of a fault, and electronic circuitry for sensing a fault, for actuating the LEDs to indicate a fault and to provide a timed reset of the LEDs to a non-fault indicating condition a predetermined time after the fault has occurred. The electronic circuitry, including a microprocessor that is normally in a sleep mode, conserves energy by drawing insubstantial current from a high capacity battery during non-fault conditions. During fault conditions, a light sensor senses the ambient lighting conditions and the microprocessor reduces current supplied to the LEDs under reduced lighting levels, such as night, further conserving battery life. The LEDs may also be operated at an intermediate illumination level, such as at dusk or dawn.