Differential Pressure Transmitter

The high performAnce differential pressure transmitter is suitable to measure liquid, gas,

or steam flow as well as liquid level, density and pressure. Its outputs a 4~20 mA DC 

signal corresponding to the measured differential pressure. Its highly accurate and stable 

sensor can also measure the static pressure which can be shown on the integral indicator 

or remotely monitored via HART communications. Other key features include quick response, 

remote set-up using communications, self-diagnostics and optional status output for pressure 

high/low alarm.

FUNCTIONAL SPECIFICATIONS

PERFORmANCE SPECIFICATIONS

Reference Accuracy of Calibrated Span:

(includes terminal-based linearity, hysteresis, and repeatability)

±0.075%，±0.1% ，±0.25%，±0.5%

If TD>10(TD=URL/SPAN), ±(0.005×TD)%

The square root accuracy is 1.5 times of reference accuracy of calibrated span.

Ambient Temperature Effects

-20℃~65℃：±(0.075×TD+0.025)%×Span

Every 10℃ is ±0.04% ×Span (TD=1)

-40℃~-20℃ &  65℃~85℃:±(0.1×TD+0.025)%×Span

Static Pressure Effects

±(0.025%URL+0.05%Span)/10MPa

Over pressure Effects

±0.05%×Span /10MPa

Stability

±0.1%×Span /3 years 

Power Supply Effects

±0.001% /10V (12~42V DC)

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.

Mounting Position Effects

Rotation in diaphragm plane has no effect. Tilting up to 90℃ will cause zero shift up to 0.4 kPa (40 mmH2O) which can be corrected by the zero adjustment.

Output

Two wire 4~20 mADC output with digital communications, linear or square root programmAble.

HART FSK protocol are superimposed on the 4~20 mADC signal. Output range: 3.9 mA to 20.5 mA.

Failure Alarm (the mode can be selected)

Low Mode (min): 3.7 mA  

High Mode (mAx): 21 mA 

No Mode (hold): Keep the effective value before the fault. Note: The standard setting of failure alarm is High Mode.

Response Time

The amplifier damping constant is 0.1 sec; The sensor damping constant is 0.1~1.6 sec, it depends on the range and range compression ratio. Amplifier damping time constant is adjustable from 0.1 to 60 sec by software and added to response time.

UpTime        ＜15s

Ambient Temperature Limits

-40 to 85℃ / -20 to 65℃ with LCD display or fluorine rubber sealing

Storage and Transportation Temperature Limits

-50 to 85℃ / -40 to 85℃ with LCD display

Working Pressure Limits (Silicone oil)

mAximum working pressure:16MPa,25MPa,40MPa