Action instruments - G428 - Ultra SlimPak - Thermocouple Input, Field Configurable Isolator

G428
Thermocouple Input, Field Configurable Isolator

TECHNICAL SPECIFICATION (G428)
Inputs	Sensor Types:	J, K, T, R, S, E, B
	Impedance:	>1MW
Bias Current (burnout detection):		<1.5microamp
	Overvoltage:	±10V differential
Common Mode (Input to Ground):		1800VDC, max.
Zero and Span Adjustability		50% of any selected range
Output	Voltage Output
	Output:	0-5V, 0-10V
	Source Impedance:	<10W
	Drive:	10mA, max.
Current Output	Output:	0-1mA, 0-20mA, 4-20mA
	Source Impedance:	>100KW
	Compliance:	0-1mA; 7.5V, max.(7.5KW)
		0-20mA; 12V, max.(600W)
		4-20mA; 12V, max.(600W)
Stability		+0.04% of the maximum full scale range per ºC change in ambient temperature, maximum.
Response Time (10 to 90%)		500mSec., typical.
Common Mode Rejection		DC to 60Hz: 120dB
Isolation		1800VDC between input, output and power.
EMC Compliance (CE Mark)
	Emissions:	EN50081-1
	Immunity:	EN50082-2
	Safety:	EN50178
LED Indication	TROUBLE LED:	Yellow, off during normal device operation.
	INPUT LED:	Green, continuously on if input is within selected range, flashes otherwise
	CAL OK LED:	Yellow, continuously on in normal device operation
Thermocouple Burnout Detect		Field configurable upscale, downscale, or disabled
Humidity (Non-Condensing)
	Operating:	15 to 95% (@ 45°C)
	Soak:	90% for 24 hours (@ 65°C)
Temperature Range
	Operating:	0 to 55°C (32 to 131°F)
	Storage:	-25 to 70°C (-13 to 158°F)
Power	Consumption:	1.5W typical, 2.5W max.
	Range:	9 to 30VDC
Terminations and Wire		Screw terminals for 12-22 AWG.
		Use twisted pair for output and power connections.
Weight		0.54 lbs
Agency Approvals		CSA certified per standard C22.2, No. 0-M91 and 142-M1987 (File No. LR42272) UL recognized per standard UL508 (File No.E99775) CE Conformance per EMC directive 89/336/EEC and Low Voltage 73/23/EEC

Diagnostic LED
The G428 is equipped with front panel LEDs for INPUT (green), TROUBLE (yellow) and CAL OK (yellow). At start-up, both the INPUT and the CAL OK LEDs flash alternately for 10 seconds while start-up takes place.

Input LED
This green LED is lit continuously when the input is within the specified range. In the full temperature range setting, for the over range condition the LED flashes at 8Hz, whereas for the under range condition it flashes at 4Hz. In a sub-range temperature setting, for the over range condition the LED flashes at 1Hz, whereas for the under range condition it flashes at 0.5Hz.

Cal ok LED
This yellow LED is continuously on when the device is calibrated.

Trouble LED
This yellow LED is off during the normal operation of the device. Consult factory if this LED is on, indicating a microprocessor malfunction.

Configuration
A major advantage of the G428 is its wide ranging capabilities and ease of configuration. The G428 offers 50% input zero and span adjustablity within each of the full-scale input ranges.

Unless otherwise specified, the factory presets the Model G428 as follows:

Input:	J-type
Range:	0 to 500°C
Output:	4 to 20mA
Burn Out:	Upscale

The DC power input accepts any DC source between 9 and 30V; typically a 12V or 24VDC source is used (see Accessories).

For other I/O ranges refer to Tables 1 through 6 and reconfigure switches SW1 and SW2 for the desired input type range and output.

Choose the desired temperature range from table 6, then use table 1 and 2 to configure the switches, as described in the following steps, for thermocouple type and range.
With DC power off, position input switches 1 and 2 on "SW2" for the desired burnout detection mode.
Set positions 4 through 10 on "SW2" for the desired thermocouple range and type.
Set positions 1 through 8 of output range switch "SW1" for the desired output signal. (Table 4)

Calibration

After configuring the dip switches, connect the input to a calibrated thermocouple source. Connect the output to the actual device load (or a load approximately equivalent to the actual device load value) and apply power.
Set the calibrator to the desired minimum input and adjust the zero potentiometer for the desired minimum output.
Set the calibrator to the desired maximum input and adjust the span potentiometer for the desired maximum output.
Repeat steps 2 and 3, if necessary for best accuracy.

Last Updated Thursday, July 28, 2005

G428Thermocouple Input, Field Configurable Isolator

G428
Thermocouple Input, Field Configurable Isolator