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Sierra 951 - page 1
Sierra Model 951 Digital Flo-Box Instruction Manual Part Number IM-951 Revision A 09-05 5 Harris Court, Building L Monterey , CA 93940 (831) 373-0200 (800) 866-0200 Fax (831) 373-4402 www .sierrainstruments.com Sierra Instruments b.v . Bijlmansweid 2 • 1934 RE Egmond a/d Hoef The Netherlands • +31 (0) 72 5071400 • Fax +31 (0) 72 5071401 Sierr ...
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Sierra 951 - page 2
Page 1 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 D ...
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Sierra 951 - page 3
INST ALLA TION AND WIRING INST ALLA TION The Model 951 enclosure is designated for panel mounting in a 1/8 DIN cutout. The cutout dimensions are shown below . T o panel mount the 951, perform the following steps: 1. Rotate the four pawl screws ( outside screws in each corner) several turns counter-clockwise to retract the pawls. Make sure the pawls ...
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Sierra 951 - page 4
Page 3 CAL T ARE H1 H2 L1 L2 Pawl Screw (1 of 4 outside screws) These 4 screws are used to mount the instrument in a panel. Menu Switch S1 (Single Function Switch) Increment Switch S2 (Single Function Switch) Step/Min-Max Switch S3 (Dual Function Switch) Zero/Exit Switch S4 (Dual Function Switch) Calibrate Switch S5 (Single Function Switch) Annunci ...
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Sierra 951 - page 5
Page 4 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | J1 P1 6 +15 vdc 8 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | J2 P2 2 1 5 Digital Gnd RXD TXD SPH1 SPL1 SPH2 SPL2 12 13 14 15 ? ...
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Sierra 951 - page 6
Page 5 SWITCH DEFINITIONS Menu Switch (S1) The Menu switch (S1) is used to cycle through the flow controller setpoints, alarm setpoints, alarm hysteresis, calibration values and decimal point locations. The sequence is as follows. The designators, in parenthesis, identify text that will be displayed, momentarily , followed by the value. Setpoint fo ...
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Sierra 951 - page 7
Page 6 SWITCH DEFINITIONS (cont) Step and Min-Max Switch (S3) This switch has a dual function. When in the MENU sequence, it steps the digit to be incremented, one position to the right. Using S3 in conjunction with S2 allows rapid updating of all parameter values. When in the MENU sequence, depressing S3 momentarily displays the maximum ...
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Sierra 951 - page 8
Page 7 FUNCTION DEFINITIONS The Mode switch (S1) cycles through the following functions. Flow Set Point (StPt) The Setpoint (0-5 vdc) command signal used to control the flow through a flow controller . The output voltage is 0-5 vdc. The setpoint output is defined as: Setpoint Output = StPt / CAL x 5.000 vdc +/- V offset (Zero value) Example: If the ...
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Sierra 951 - page 9
Page 8 FUNCTION DEFINITIONS (cont) Alarm Set Point High 2 (SPH2) SPH2 is independent and functions identically to SPH1. SPH2 has its own open collector outputs and front panel LED (H2). Alarm Set Point Low 2 (SPL2) SPL2 is independent and functions identically to SPL1. SPL2 has its own open collector outputs and front panel LED (L2). Alarm Hysteres ...
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Sierra 951 - page 10
Page 9 FUNCTION DEFINITIONS (CONT) Decimal Point (dP) dP allows selection of decimal point locations for display . The locations selectable are x.xxxx, xx.xxx, xxx.xx, xxxx.x and xxxxx. ...
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Sierra 951 - page 11
Page 10 OPERA TING INSTRUCTIONS TURN-ON INSTRUCTIONS Reference Figures 3 and 4 for proper input and output signal wiring. 1. Apply power to the instrument. 2. V erify the instrument readout blanks momentarily , then displays the value of the input signal. If the display blinks continuously it is because the Model 951 is not receiving a signal. Chec ...
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Sierra 951 - page 12
Page 1 1 PROGRAM INSTRUCTIONS (cont) 2. Depress MODE (S1) switch once. The text followed by the current value of Alarm Set Point High 1 (SPH1) will be displayed. Use S2 and S3 to set Alarm Set Point High 1 to the desired value. Proceed to Step 3 to set Alarm Setpoint Low 1 (SPL1) or depress S4 to exit MODE sequence. If S4 is depressed, ...
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Sierra 951 - page 13
Page 12 PROGRAM INSTRUCTIONS (cont) 7. Depress MODE (S1) switch once. The text followed by the current value of Hysteresis Low will be displayed. Repeat Step 2 to set Alarm Hysteresis Low to the desired value. The maximum value for HL is 99 counts. Proceed to Step 8 or depress S4 to exit. 8. Depress MODE (S1) switch once. The text ...
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Sierra 951 - page 14
Page 13 Prior to connecting the 951 to the Flowmeter or Controller , verify that the Controller's +/-15 vdc requirement is no more than 40 0 ma. The 951 is capable of supplying up to 500ma for short periods of time ( in 1/2 or 1 hour increments). Consult the factory if the current requirement is > 350ma for prolonged periods of time. Connec ...
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Sierra 951 - page 15
Page 14 CALIBRA TION INSTRUCTIONS (cont) 6. Depress and hold CAL (S5) for approximately 3 seconds. The FS CAL LED should illuminate and the readout should display the FS Cal value within +/- 1 digit. 7. The CALIBRA TION sequence is now complete. NOTE: Calibration information (zero and scale factor values) are stored in non-volatile memory and are u ...
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Sierra 951 - page 16
Page 15 RS232 SERIAL COMMUNICA TIONS (Special Order Only) The Parity (Even or None) and the Baud Rate (2400 or 9600) are selectable by setting DIP switches SW a and SWb, accessible from the right side of the instrument case. ON OFF SW a SWb Parity (SWa) Baud Rate (SWb) ON = Even ON = 2400 OFF = None OFF = 9600 Baud Rate: Programmable for 2400 or 96 ...
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Sierra 951 - page 17
Page 16 RS232 SERIAL COMMUNICA TIONS (Special Order Only) [Z] [CR] [LF] Zero the displayed reading [F] [CR] [LF] Calibrate Full Scale (Input signal is scaled to display Full Scale) [S] [counts] [CR] [LF] Set Full Scale display value. (counts range = 0 .... 99999) ...
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Sierra 951 - page 18
MODEL SR5 PROGRAM MENU DIAGRAM Depress MODE ST ART Set Depress Depress Increments Flashing Digit Steps Flashing Digit to Right Set Depress MODE Depress MODE OPERA TE ...
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