Setra System Model 201 - Manual (Page 3)

3
4.0 Calibration
All Setra current pressure transducers are carefully calibrated to the specific input
pressure range vs. output current at the factory so little or no field calibration is
necessary. Model 201 transducers are factory calibrated using a 250 ohm load at
24 VDC. External zero and span adjustment capability is approximately
±0.5 mA,
individually. Zero and span adjustments are made by removing the pan head
screws and turning the potentiometer screw inside. A jeweler’s screwdriver or a
.015” x 3/32” flathead screwdriver with a 3” shaft is easiest to use for making zero
and span adjustments. It is important to replace the screws after adjustments are
made to avoid allowing moisture to enter the transducer.
Performance Data
Accuracy RSS * (at constant temp)
±0.5% FS
Non-Linearity, BFSL
±0.45% FS
Hysteresis 0.025% FS
Non-Repeatability 0.025% FS
Thermal Effects **
Compensated Range
°F (°C)
-25 to +175 (-33 to +80)
Zero Shift %FS/100
°F (50°C)
2.0 (1.8)
Span Shift %FS/100
°F(50°C)
1.5 (1.4)
Warm-up Shift 0.1% FS/15 Minutes
Response Time 20 Milliseconds
Long Term Stability 0.5% FS/1 YR
Proof Pressure*** 45 PSI
Burst Pressure 100 PSI
*RSS of Non-Linearity, Non-Repeatability and Hysteresis.
**Units calibrated at nominal 70
°F. Maximum thermal error computed from
this datum.
***Proof Pressure: The maximum pressure that may be applied without
changing performance beyond specifications (
±0.5% FS zero shift).
Environmental Data
Temperature
Operating
*
°F (°C)
-40 to +175 (-40 to +80)
Storage
°F (°C)
-40 to +212 (-40 to +100)
Acceleration 10g Maximum
Shock** 50g Operating
*Operating temperature limits of the electronics only.
Pressure media temperature may be considerably higher or lower.
**Mil-Std 202F, Method 213B, Cond.C
Physical Description
Case Stainless Steel
Pressure Fitting 1/4” VCR Male
1/4” VCR Female
Vent Through Porous Plug at
Bottom of Case
Electrical Connection Multiconductor Cable
Hirschmann Connector
Bayonet Connector
3 Screw Terminal Block
Zero/Span Adjustment Top External Access
Weight
6 ounces
Electrical Data (Current)
Circuit 2-Wire
Output * 4 to 20 mA **
External Load 0 to 800 Ohms
Minimum supply voltage (VDC) = 12 + 0.02 x
(Resistance of receiver plus line).
Maximum supply voltage (VDC) = 30 + 0.004 x
(Resistance of receiver plus line).
*Calibrated at factory with a 24 VDC loop supply voltage and
a 250 ohm load.
**Zero output factory set to within
±.08mA.
**Span (Full Scale) output factory set to within
±.08mA.
Pressure Media
Liquids or Gases Compatible with Stainless Steel
and Inconel.
5.0 Model 201 Specifications