ElecMK
72
C&ΕΝ
Tel-O-Set—the
true 2-wire system
TAKING THE HEAT OFF FIELD-MOUNTED TRANSMITTERS
The ElectriK Tel-O-Set System takes t h e heat off fieldmounted instruments by eliminating heat-generating tubes and power packs. There's no external power required at any Tel-O-Set field-mounted instrument. T h e line power connection is made only at the receiver. Tel-O-Set field-mounted instruments operate on a low calorie diet of 4-20 milliamps . . . less than 0.6 watts. A simple two-wire line connects t h e field-mounted instru ments with the control room. T h e two wires carry the control signal as well as the power. The d-c transmission avoids stray pickup and phasing problems . . . eliminates the need for shielding the line. The 4-20 milliamp signal range of the system gives a live zero and permits the use of the most reliable transistors available. These d-c signals can be fed into data handling systems and millivolt-actuated instruments . . . can be
easily transduced to a standard 3-15 psi pneumatic signal to operate existing pneumatic systems. The basic circuit used in Tel-O-Set transmitters, receivers, controllers and other instruments has been thoroughly proved in thousands of applications in the last five years. This circuit uses a force-balance feedback system to increase the accuracy and the dynamic response of t h e system by decreasing hysteresis effects and sensitivity to changes in ambient conditions. Take a new look at your control applications with t h e ElectriK Tel-O-Set System in mind! Get complete techni cal data from your local Honeywell field engineer. Call him today . . . he's as near as your phone. MINNEAPOLISHONEYWELL, 21 Penn Street, Fall River, Mass.
Honeywell G & Ε Ν 73
