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DescriptionThe OMEGA RD-87 Series strip chart recorders are offered in different models to record either a J Thermocouple, Temperature, Temperature/Humidity, Voltage, Current, or a 4 to 20 mA input signal on a 100 mm (4") wide strip chart, with a single pen. The temperature/humidity model uses two pens. Pens are colored to maximize chart readability. All RD-87 models offer a LCD display and user friendly controls. A full function alarm feature is provided on the RD-87 Series. The alarm can be set to sound an audible signal when the measured value(s) has exceeded an upper or lower limit. Each limit is individually set from the front panel. A delay time before the alarm is activated may be set by the user to prevent nuisance alarms caused by short-term variations. Low power normally open relay contacts are provided to allow activation of a remote alarm, phone dialer or annunciation.