Instruction/ maintenance manual of the product 951 Sierra
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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 .
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.
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.
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.
Page 4 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | J1 P1 6 +15 vdc 8 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |.
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.
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.
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.
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.
Page 9 FUNCTION DEFINITIONS (CONT) Decimal Point (dP) dP allows selection of decimal point locations for display . The locations selectable are x.xxxx, xx.
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.
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.
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.
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).
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.
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.
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.
MODEL SR5 PROGRAM MENU DIAGRAM Depress MODE ST ART Set Depress Depress Increments Flashing Digit Steps Flashing Digit to Right Set Depress MODE Depr.
An important point after buying a device Sierra 951 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Sierra 951 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Sierra 951 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Sierra 951 you will learn all the available features of the product, as well as information on its operation. The information that you get Sierra 951 will certainly help you make a decision on the purchase.
If you already are a holder of Sierra 951, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Sierra 951.
However, one of the most important roles played by the user manual is to help in solving problems with Sierra 951. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Sierra 951 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
