Sierra 951 instruction manual Description, Specifications

DESCRIPTION

The Model 951 Digital Flow Box is a microprocessor-based digital indicator and power supply, capable of interfacing directly to a mass flow meter or a mass flow controller. The integrated +/-15 vdc @250ma power supply provides a well regulated, short circuit and thermal overload protected output. It is packaged in a small 1/8 DIN, 5.5" deep extruded aluminum housing which provides excellent EMI/RFI shielding and good heat dissipation characteristics.

The Model 951 is a state-of-the-art product and uses the latest surface mount components. The internal microprocessor provides the following capabilites.

Pushbutton Zero and Full Scale Calibration

Front Panel Setup of Flow Controller Setpoint Voltage (0-5 vdc) Front Panel Setup of (2) High and (2) Low Digital Alarms with open collector outputs.

SPECIFICATIONS
Signal Input:	0-5 vdc
Input Resistance:	> 1 Megohm
Input Bias Current:	< 1 na
Display Type:	0.4" high efficiency red LED's
Max display range:	+/- 99,999 counts
A/D Resolution:	+/- 19,999 counts
Linearity:	+/- 0.01% FS +/- 1 count
FS Accuracy:	+/-0.01% FS +/- 1 count
FS Step Response:	500ms (typ)
Overrange Display:	Flashing digits for input > 5.5 vdc
No Sensor Indication:	Flashing digits
Flowmeter Setpoint Output: 0-5 vdc
Flowmeter Power Supply:	+/- 15 vdc +/- 5% @ 400 mA (max)
	+/- 15 vdc +/- 5% @ 250 mA (min)
Operating range:	-10 to +50 degC
Input Power:	100, 110 and 240 VAC
	(solder pad jumper selectable)
Pkg dimensions:	3.78W x 1.89H x 5.13D

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