Michell Instruments Pura 2-Wire, Руководство пользователя

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Pura 2-Wire/3-Wire/Digital Transmitter
User’s Manual
Michell Instruments 15
APPENDIX A
Appendix A Technical Specifi cations
Performance Specifi cations
Pura 2-Wire
Pura 3-Wire /
Digital Transmitter
Measurement Range (dp) -120 to -40°C (-184 to -40°F) dew point
Accuracy (dp)
±1°C from -40 to -60°C (-40 to -76°F)
±2°C from -60 to -100°C (-76 to -148°F)
±4°C from -100 to -120°C (-148 to -184°F) (estimated)
Repeatability 0.5°C (0.9°F) dew point
Electrical Specifi cations
Output Signal
4-20 mA, 2-wire connection,
current source
(user-con fi gurable over range
using communication kit and
software)
3-wire 4-20 mA, 3-wire
connection, current source (user-
con fi gurable over range using
communication kit and software)
Digital Transmitter, digital string
(signal), 4-wire connection (user-
con fi gurable over range via monitor
front panel)
Output
Dew point or moisture content
for ppm
V
Dew point
Output Range -120 to -40°Cdp (-184 to -40°Fdp)
Supply Voltage 12 to 28 V DC
Load Resistance
Max 250 Ω @ 12 V
(500 Ω @ 24 V)
Max 300 Ω @ 12 V
(900 Ω @ 24 V)
Current Consumption 23 mA
Supply Voltage In fl uence ±0.005% RH/V
Operating Specifi cations
Operating Humidity 0 -100% RH
Operating Temperature -40 to +60°C (-40 to +140°F)
Operating Pressure 24 MPa (240 barg / 3480 psig)
Flow Rate 1 to 10 Nl/min (2.1 to 21.2 scfh) (5 Nl/min (10.6 scfh) optimum)
Mechanical Specifi cations
Ingress Protection
IP66 in accordance with standard BS EN 60529:1992
NEMA 4 in protection accordance with standard NEMA 250-2003
Housing Material Stainless steel
Mounting Thread
¼” male VCR gas in/out connections
½” male VCR sensor connection
Weight
PRM and OEM versions: 450g (15.87oz)
Pura SEN version: 180g (6.34oz)
Interchangeability
Fully interchangeable transmitter
(of same type only - i.e. 2-wire with 2-wire)
Electrical Connections Screw terminal
Fault Conditions
(factory programmed)
Condition
Sensor fault
Under-range dew point
Over-range dew point
Output
23 mA
4 mA
20 mA