JENCO 765 Manuale utente

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OPERATION MANUAL

MODEL 765

THERMOCOUPLE PANEL THERMOMETER

]

JENCO ELECTRONICS, LTD.

MANUFACTURER OF PRECISION INSTRUMENTS

GENERAL INTRODUCTION:

The model 765 digital indicating panel thermometer is a high performance industrial

grade readout for types K, J, T, E thermocouple sensors and 3-wire RTD (PT-l 00). The

thermocouple gain, linearization, and cold junction are automatically compensated by

internal electronic circuits.

The temperature scale can be easily changed from to ℉and vice versa by an

internal jumper without re-calibration.

An accurate I mV per display count analog output is provided to interface the

instrument with a recorder, printer, etc.

For rapid changing display, the ''HOLD'' function may be used to freeze the display.

INITIAL INSPECTION:

Carefully unpack the instrument. Inspect damage in shipment. If any damage is found,

notify your JENCO distributor immediately. All packing material should be saved until

satisfactory operation is confirmed.

SPECIFICATION :

MODEL TYPE RANGE RESOULTION ACCURACY

765K K -105 to 1372 1 1.5 ,1 digit

-l57℉to 1999℉l℉2.7℉,l digit

765 J -210 to 760 1 1.5 ,1 digit

-346℉to 1400℉l℉2.7℉,1 digit

765T T -105 to 400 1 1.5 ,1 digit

-157℉to 752℉1℉1.5℉,1 digit

765E E -105 to 1000 1 1.5 ,1 digit

-157℉to 1832℉1℉2.7℉,1 digit

765PT PT-100 -50.00 to 199.9 0.1 0.1 ,1 digit

-58℉to 199.9℉0.1℉0.2℉,1 digit

765PTB PT-100 -50 to 850 1 1 , 1 digit

-58℉to 1562℉1℉1℉,1 digit

GENERAL :

Analog Output (linearized) 1 mV/count

Analog Output Accuracy +0.2% of reading , +1 mV

(accuracy specified at 23"C, +5'C)

T/C Resistance 100 (min)

Sensor Break indication Positive over range (upscale)

Display 0.56" High efficiency LED

Power 115V AC, 230V AC, ±l0%,50/60 Hz

Dimensions 48mm x 96mm x 110mm

MOUNTING PROCEDURE:

1. Make a cutout on any panel, with a thickness of l/l 6 inch (l .5 mm) to 3/8 inch (9.5

mm) Refer to DRAWING 1.

PANEL CUTOUT

DRAWING 1

2. Remove the mounting brackets assembly from the panel meter and insert the panel

meter to

PANEL METER WITR MOUNTING BRACKET AND SCREW

DRAWING 2

3. Replace the mounting brackets assembly into the panel meter and fasten the

mounting screws to secure the panel meter to the mounting panel. Refer to

DRAWING 3.

MOUNTING METHOD

DRAWING 3

ANALOG VOLTAGE OUTPUT:

The analog voltage output can be used to interface with other instruments such as

recorder, printer, remote indicator, 4-20 mA converter, etc.

The following rule must be observe in order to avoid reading inaccuracies or possible

damage to the instrument.

1. If grounded or naked thermocouple is used, the interface device's circuit

common must not be connected to earth ground.

2. The input impedance of the interface device must be greater than 10K

3. Be sure that the AC line voltage is never connected to analog output.

WIRING DIGRAM:

1. Connect the AC line to the rear of instrument. The model 765 can be used with

115V AC or 230V AC, 50/60 Hz. Refer to DRAWING 4 and DRAWING 5.

2. Connect the two thermocouple leads to the rear of instrument and be sure to

observe the correct polarity of thermocouple leads. Refer to DRAWIN 4 and

DRAWING 5.

3. The "HOLD" function is activated by connecting the "HOLD" terminal to

ANALOG GND TERMINAL

WIRING DIAGRAM FOR T/C MODEL

DRAWING 4

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