ST100A Series Flow Meter TROUBLESHOOTING
Fluid Components International LLC 101
Allowable Limits
Example 1 - 4-20 mA output check using 1-5 VDC measurement.
Accuracy: ±(0.75% reading + 0.5% full scale) from GF90 Manual
Example Delta R Table entry:
Delta R (ohms)
VDC Across
250 ohms
mA Output Unit dR
Indicated
Display
71.08 2.995 11.98 71.197 154.8 SCFM
• Measure VDC with FES-200 thumbwheel set to 071.08 = 3.011 VDC measured on DMM.
• Determine allowable VDC limits for the 2.995 VDC table value:
Since the 1-5 VDC range starts at 1 VDC, account for this offset by subtracting 1 VDC from both the “reading” of
2.995 VDC and the “full scale” of 5 VDC.
• Allowable VDC limits = 0.0075 x (2.995 – 1) + 0.005 x (5 – 1) = ±0.035 VDC
The measured value of 3.011 VDC is within the allowable limits of 2.995 ±0.035 VDC.
Example 2 - 4-20 mA output check (using example 1 sample data)
• Measure mA with FES-200 thumbwheel set to 071.08 = 12.04 mA measured on DMM.
• Determine allowable mA limits for the 11.98 mA table value:
Since the 4-20 mA range starts at 4 mA, account for this offset by subtracting 4 mA from both the “reading” of 11.98
mA and the “full scale” of 20 mA.
• Allowable mA limits = 0.0075 x (11.98 – 4) + 0.005 x (20 – 4) = ±0.139 mA
The measured value of 12.04 mA is within the allowable limits of 11.98 ±0.139 mA.
Example 3 - Indicated Display Check (using information from above examples)
• Record the indicated display value with FES-200 thumbwheel set to 071.08 = 156 SCFM indicated on display.
• Determine allowable limits for the 154.8 SCFM table value:
The full scale display value is 310 SCFM in this example.
• Allowable Indicated flow limits = 0.0075 x 154.8 SCFM + 0.005 x 310 SCFM = ± 2.71 SCFM
The indicated value of 156 SCFM is within the allowable limits of 154.8 ±2.71 SCFM.
Defective Parts
Before returning any equipment to FCI, obtain an RA number for authorization, tracking, and repair/replacement instructions. If a return is
required, remove the defective part, replace with a spare, calibrate, then return defective part to FCI, freight prepaid, for disposition.
Customer Service
1. In the event of problems or inquiries regarding the instrument, contact an authorized FCI field agent for the region or country. Refer to
the FCI website: http://www.fluidcomponents.com/
for a list of field service representatives (which includes phone and email contact
information) and a list of service centers around the world.
2. Before contacting the FCI representative make sure that all the applicable information is near so that a more effective, efficient and
timely response can be provided.
3. Refer to APPENDIX E, page 157 for specific Customer Service policy provisions.
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