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The Ashcroft XLdp is a variable capacitance sensor within a glass-clad silicon chip. The patented Si-Glas™ technology combines the inherent high sensitivity of a variable capacitance transducer with the repeatability of a micro-machined, ultra-thin silicon diaphragm.
The Ashcroft Si-Glas sensor now enables precise measurement and control of very low pressure. Although the ultra-thin silicon diaphragm deflects only a micron, the sensor is 100 times more sensitive to pressure than available silicon piezoresistive pressure sensors.
The Si-Glas sensor is composed of only sputtered metals and glass molecularly bonded to silicon. There are no epoxies or other organics in the sensor to contribute to drift or mechanical degradation over time. The glass-clad silicon diaphragm withstands extreme overpressure as well as severe shock and vibration.
PERFORMANCE SPECIFICATIONS
Ref. Temperature: 70°F ±2°F (21°C ±1°C)
Accuracy Class (of Span)
Two Options: ±0.25%, ±0.50%
Includes non-linearity (Terminal Point Method), hysteresis,
non-repeatability, zero offset and span setting errors.
Stability – Max. Change (Span/year): ±0.25 %
Standard Ranges (Inches W.C.)
Unidirectional Ranges:
Differential or Gauge
0/0.10 0/1.00 0/ 3.00 0/25.00
0/0.25 0/1.50 0/ 5.00 0/50.00
0/0.50 0/2.00 0/10.00
0/0.75 0/2.50 0/15.00
Bidirectional Ranges:
Compound
±0.05 ±1.00 ± 5.00
±0.10 ±2.00 ±10.00
±0.25 ±2.50 ±25.00
±0.50 ±3.00 ±50.00
Custom Ranges: Special range calibrations
(XCL) – consult factory
Standard Response Time: 250msec
(Consult factory for damping options)
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits:
Storage: –40 to 180°F
Operating: –20 to 160°F
(10-95% R.H. non-condensing)
Compensated Range: +35 to 135°F
Thermal Coefficients:
ZERO ±0.015% Span/°F
SPAN ±0.015% Span/°F
Vibration Sweep: Less than 0.05% Span temporary
effect with 5 g’s 0-60 Hz
CE Marked*: Per DoC
EMC Directive 2004/108/EC
IEC/EN 61326-1:Edition 1.0 Industrial
IEC/EN 61326-2-3:Edition 1.0 Annex BB Industrial
FUNCTIONAL SPECIFICATIONS
Overpressure Limits:
Proof 15 psid
Burst 25 psid
Max. static line pressure 25 psi
Mounting Position Effect:
0.5˝ W.C. and higher ± 0.10% Span/g
0.25˝ W.C. ± 0.25% Span/g
0.1˝ W.C. ± 0.50% Span/g
Note: Calibrated horizontally standard unless
otherwise specified. Mounting Position Effect
easily corrected with zero potentiometer.
ELECTRICAL SPECIFICATIONS
Output Signal: Power:
4-20mA (2 wire)* 12-36 Vdc
1-5 Vdc (3 wire) 12-36 Vdc
1-6 Vdc (3 wire) 12-36 Vdc
*Optional CE version
Output Signal is Independent of Power Supply
Changes:
12-36 Vdc range without effect on output signal
Reverse Wiring Protected Zero and Span
Potentiometers: Externally accessible, noninteractive,
±10% F.S. adjustment
Supply Current: <6mA for voltage output
Warm-up Time: 5 seconds max. to meet stated
specifications
*Applies to 4-20mA output units with XCE option
PHYSICAL SPECIFICATIONS
Pressure Connections:
1⁄4˝ barbed stainless steel
1⁄8˝ barbed stainless steel (optional)
1⁄4 NPT female stainless steel (optional)
Electrical Connections: Teminal strip
Weight: 14 oz, NEMA 2 Case
MATERIALS:
Case: 300 series stainless steel
Media: Clean, dry, non-corrosive gas
(consult factory for use on other media)
DO NOT USE ON LIQUIDS
NOTES:
• Calibration curve (0.25%) or data (0.50%)supplied with each transmitter
• Consult factory on other pressure range, temperature compensation or packaging variations
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