JCMC Multivariable Transmitter with hart

consists of a differential pressure sensor module with integrated electronic adapter unit, an amplifier module with a control unit and a two-wire system RTD input terminal to measure process temperature

The  transmitter  adopts  modularized  design.  It  consists  of  a  differential  pressure  sensor  module  with integrated electronic adapter unit, an amplifier module with a control unit and a two-wire system RTD input terminal to measure process temperature. The sensor module adopts full-welded structure, interior of which is a twin-barrel system with an intact overload isolation diaphragm, and one absolute pressure sensor and one differential pressure sensor are installed inside. The absolute pressure sensor is only installed on the high-pressure  side,  and  the  measured  pressure  will  be  taken  as  reference  value,  in  order  to  compensate influence from static pressure. The differential pressure sensor is made up of one capillary tube connected with negative pole of the sensor module. 

An additional differential pressure (Dp) will be applied onto diaphragm of the differential pressure sensor through the isolation diaphragm and filler liquid. Check for tiny variation of the diaphragm, which shall result in changes of output voltage of the testing system. The voltage signal direct proportional to the input pressure will be digitalized through the adapter before being transmitted  into  the  amplifier,  and  then  the  amplifier  will  perform  linearization  on  the  signal  as  well  as temperature compensation. Then, three values of Dp, P and T can be converted signals direct proportional to mass flowrate through compensation. Except for mass flowrate (Qm), Dp, P, T and Qv can also make for other purpose of application. According  to  differences  of  transmitter  models,  connection  between the transmitter  and  process  can  be  fulfilled  through  female  screw  on  elliptic  flange  on  the  transmitter,  or connection between remote flanges and process pipelines or flanges.

The transmitter adopts a two-wire system, the same pair of leads in which can be used to connect working voltage,  signal  outputs  (4～20mA)  and  digital  quantities.  Electrical connection can be fulfilled through interconnection with terminals through cable inlet.

BCST Multivariable Transmitter Model Selection

Sample
JCMT		JCMT Multivariable Pressure Transmitter
Output	H	Two wire 4-20ma DC ( Hart )			M
	M	Three wire 4-20ma DC Output: flow rate
Sensor	Differential Pressure	Compound Micro-Silicon Sensor	Capacitance Sensor		B
		A	0-50pa to 1pa (Rated pressure is 0.6mpa)	2E	0 to 1.5Kpa
		B	0 – 200pa to 6 kpa	3E	0 to 7.5kpa
		C	0 -400pa to 40kpa	4E	0 to 37.4 kpa
		D	0-2.5kpa to 250 kpa	5E	0 to 186 kpa

BCST Metal Capacitance Transmitter PERFORMANCE SPECIFICATIONS

Reference Accuracy of Calibrated Span (includes

terminal-based linearity, hysteresis, and repeatability)

± 0.1%/± 0.01%

If T t;10 (TD=URL/SPAN):

±(0.0075×TD)%/ ±(0.01×TD)%

Ambient Temperature Effects

-20℃～65℃：±(0.15×TD+0.05)%×Span

Every 10℃ is ±0.08% ×Span (TD=1)

-40℃～-20℃ & 65℃～85℃：

±(0.2×TD+0.05)%×Span

Static Pressure Effects

±(0.05%URL+0.075%Span)/10MPa

Overpressure Effects: ±0.1%×Span /10MPa。

Stability: ±0.1%×Span /3 years

Power Supply Effects

±0.001% /10V (12～42V DC)

Measuring Temperature

-50℃～650℃

Zero Adjustment Limits

Zero can be fully elevated or suppressed, within the

lower and upper range limits of the capsule.

External Zero Adjustment

External zero is continuously adjustable with 0.01%

incremental resolution of span. Re-range can be done

locally using the range setting switch.

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