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Transmitters 800 Series Larc Relay Transmitter

A compact single set point relay control. The LARC is designed to work with any Data Industrial nonmagnetic flow sensors to provide a simple and flexible means of control based on flow rate.

Series 800
Local Adjustable Relay Control

The Data Industrial Model 800 (housed) and 850 (unhoused) Local Adjustable Relay Control (LARC) is a compact single set point relay control.

The LARC is designed to work with any Data Industrial nonmagnetic flow sensors to provide a simple and flexible means of control based a flow rate. When the sensor detects a preset rate of flow, the LARC actuates a set of relay contacts that can be used to switch a variety of devices.

Like all Data Industrial products the LARC can be combined with other Data Industrial flow monitors, analog transmitters, or LARCs to provide multiple set points or information display and control outputs from a single sensor. The LARC is compatible with most units of liquid flow measurement.

 

Model 850
Product Features:

User Adjustable Set Point - The user can set the LARC on site to trigger over a wide range of flow rates. User sets the LARC to react above, or below the set point. An LED indicates relay status by lighting when the relay is energized.

HI-LO Range feature - allows the LARC to be used with the 4000 Series Sensors (LO Range) or the 200 Series Sensors (HI Range).

Form "C" Relay Contacts - Rated 5 amps @ 125 VAC allow maximum flexibility of control functions through both normally open, and normally closed contacts.

Adjustable Time Delay - User adjustable up to 100 sec. "ON" delay before the relay triggers. This allows for normal surges in flow rate to dampen out before the circuit is triggered.

Adjustable Deadband - The user can adjust, in a range of flow from 5% to 50% of the set point, between the points where the relay is activated and deactivated. At the low end, 5%, this deadband prevents the LARC relay from chattering if the flow rate stays at the set point. At the high end, the deadband can act like an "OFF" delay to help prevent pump cycling.

Latch Feature - The user may choose to actuate an electronic latch that will hold the LARC relay in an "energized" position until manually reset. The reset operation requires the user to acknowledge the LARC has reached an alarm point by physically pushing an internal reset button or interrupting the power supply. In the case of remote LARC installations, the reset can be accomplished by momentarily turning off the power supply to the LARC. The user may choose not to actuate the latch feature for continual duty such as pump motor control.

Variety of Power Inputs - The LARC is designed to accept a variety of power inputs, from 12-30 VAC or 12-40 VDC. The relay contacts can be operated separately on voltages up to 250 VAC in addition the LARC circuit contains special transient suppression safety features.

 

 

• Series 800 Installation & Operation Manual
• Model 800/850 Local Adustable Relay Control Technical Brief