EASTERN INSTRUMENTS

QVT SPECIFICATIONS

QVT Multivariable Smart Transmitter for measuring the velocity pressure or Differential Pressure across any flow element in order to measure the flow of air through a duct
The QVT from Eastern Instruments is a multivariable transmitter that has been optimized for the extremely accurate flow measurement of air and gas at or near atmospheric pressure (5 - 25 psia). Allowing for the measurement of up to four separate process variables including Differential Pressure, Temperature and Absolute Pressure, the QVT will calculate the fully compensated mass flow of air or gas in nearly any duct. When coupled with any Differential Pressure based flow element, the QVT ensures extremely accurate flow measurement down to +/-0.50% of Reading over 100:1 range of DP and 10:1 flow turndown.

Below are the specifications for the QVT Multivariable transmitter, including specifications for the sensors as well as the outputs.



QVT SPECIFICATIONS





QVT SPECIFICATIONS

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DIFFERENTIAL PRESSURE SENSOR ACCURACY

OPERATING
TEMPERATURE
HIGH ACCURACY
EXTREME ACCURACY
25° C
+/- 0.05% Reading and +/- 0.005% URL
at Operating Temperature of 25° C
0° C to 50° C
+/- 0.2% Reading and +/- 0.2% URL
at Operating Temperature of 0° C to 50° C
+/- 0.05% Reading and +/- 0.005% URL
at Operating Temperature of 0° C to 50° C
-20° C to 70° C
+/- 0.05% Reading and +/- 0.005% URL
at Operating Temperature of -20° C to 70° C
  • Operating Range: 10000:1 (0.0009 in WC to 9.0 in WC)
  • Rangeability:160:1 (0 to 0.05 in WC - 0 to 8.0 in WC) - 4-20 mA Full Scale Range
  • Position Effect: Less than 0.00375% URL in any plane


ABSOLUTE PRESSURE SENSOR ACCURACY

OPERATING
TEMPERATURE
HIGH ACCURACY
EXTREME ACCURACY
25° C
+/- 0.05% Reading and +/- 0.005% URL
at Operating Temperature of 25° C
0° C to 50° C
+/- 0.2% Reading and +/- 0.2% URL
at Operating Temperature of 0° C to 50° C
+/- 0.05% Reading and +/- 0.005% URL
at Operating Temperature of 0° C to 50° C
-20° C to 70° C
+/- 0.05% Reading and +/- 0.005% URL
at Operating Temperature of -20° C to 70° C


PROCESS TEMPERATURE SENSOR ACCURACY

OPERATING
TEMPERATURE
ACCURACY
-328° F to 1562° F
+/- 0.05% Reading (abs); +/- 0.005% URL (abs)
  • QVT Compatibility: Any Class A DIN 100 ohm 385 Platinum RTD 3-Wire Sensor


MASS FLOW COMPUTATION ACCURACY

OPERATING
TEMPERATURE
HIGH ACCURACY
EXTREME ACCURACY
25° C
+/- 0.50% Reading 100:1 dP (10:1 flow) Range
+/- 1.0% Reading 225:1 dP (15:1 flow)
0° C to 50° C
+/- 0.50% Reading 100:1 dP (10:1 flow) Range
+/- 1.0% Reading 225:1 dP (15:1 flow)
-20° C to 70° C
+/- 0.50% Reading 100:1 dP (10:1 flow) Range
+/- 1.0% Reading 225:1 dP (15:1 flow)