Sierra 951 用户手册

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