2 System description
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB | 9
Input/output specifications
The multivariable transmitter features multiple inputs that include DP, SP, and temperature. The transmitter output is RS-485
MODBUS
®
communication.
Differential pressure input
The transmitter includes a differential pressure input. The specifications are documented in Table 3.
Table 3: Differential pressure specifications
User calibrate spans from 1:1 to 10:1 (for spans > 10:1, see DS/2101130)
Static pressure effect (SPE) to DP
Zero (zero errors can be
calibrated out at line pressure)
Up to 1450 PSI: 0.02% of FCS
5
>1450 PSI: 0.02% of FCS
5
per 1450 PSI
±0.15% of FCS
5
over a 24 month period
Ambient temperature effect
Between the temperatures of -35 °F to +185 °F
±0.04% of FCS
5
, ±0.02% of reading
Static pressure effect (SPE) to DP
span
Up to 1450 PSI: 0.02% of reading
>1450 PSI: 0.02% of reading per 1450 PSI
±1.5 InH
2
O (3.74 mbar) according to IEC 61298-3 “Field with general application or pipeline with low
vibration”
Static pressure input
The transmitter includes a static pressure input. The specifications are documented in Table 4.
Table 4: Static pressure specifications
User calibrated spans from 1:1 to 10:1 (for spans > 10:1, see DS/2101130)
±0.15% of FCS
5
over a 24 month period
Ambient temperature effect
Between the temperatures of -35 °F and +185 °F
±0.05% of FCS
5
, ±0.02% of reading
±0.05 InH
2
O (0.00345 bar) according to IEC 61298-3 “Field with general application or pipeline with low
vibration”
Including linearity, hysteresis, and repeatability at reference conditions
FCS is Factory Calibrated Span. This is the pressure range over which the factory thermally calibrated the sensor.
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