Series 830/840/860 Instruction Manual

 

Appendix B Specifications

 

 

 

 

Control Range

840/860C

2 to 100% of full scale; valve shuts when flow drops below

 

2%

 

 

 

840 (NPT)

10 to 100% of full scale

Command Signal

0-5 VDC, 20 megaohms minimum input impedance

 

4-20 mA, 250 Ohms maximum input impedance, optional RS-485 digi-

 

tal signal standard on Model 860C

Output Signal

Linear 0-5 VDC, 1000 Ohms minimum load resistance

 

Linear 4-20 mA, 500 Ohms maximum loop resistance

Model 860

 

 

 

RS-485 Communication

Output signal; command signal; continuous K-factor (span) change;

 

discrete Auto-Balance, change RS-485 address; complete calibration

 

data and accumulated hours since last calibration; change PID re-

 

sponse; valve off; and many other functions including “cloning” of two

 

MFCs for perfectly matched performance

Model 860

 

 

 

Auto-Balance™ Circuitry

Automatic adjustment (manual or auto mode) of bridge resistors to re-

 

tain zero; occurs when valve is shut; maintains correct zero value if

 

power is interrupted

 

 

Performance Specifications

 

 

Accuracy

±1% of full scale including linearity over 15 to 25°C and 10 to 60 psia

 

(0.7 to 4 bara); ±2% of full scale including linearity over 0 to 50°C and 5

 

to 50 psia (0.3 to 10 bara); ±1% of full scale accuracy at a specific tem-

 

perature and pressure is available with special calibration; For the mod-

 

els 840 (NPT), the accuracies above are 1.5%, ±3%, and ±1.5%, re-

 

spectively

 

 

Repeatability

±0.15% of full scale

 

 

 

±0.5% of full scale for 840 (NPT)

Temperature Coefficient

0.027% of full scale per °F (0.05% of full scale per °C), or better

Pressure Coefficient

0.01% of full scale per psi (0.15% of full scale per bar), or better

Response Time

830 (all)

300 ms time constant; 2 seconds (typical) to within ±2%

 

 

of set point over 20 to 100% of full scale

 

840 (low, med)

300 ms time constant; 2 seconds (typical) to within ±2%

 

 

of set point over 20 to 100% of full scale

 

840 (high)

600 ms time constant; 4 seconds (typical) to within ±2%

 

 

of set point over 20 to 100% of full scale

 

840 (NPT)

800 ms time constant; 4 seconds (typical) to within ±5%

 

 

of set point over 20 to 100% of full scale

 

860 (all)

0.6 to 1 second to within ±2% of set point over 20 to 100%

 

 

of full scale

Physical Specifications

 

 

Wetted Materials

830 (all)

316 stainless steel, Viton® O-rings standard; Neoprene® and

 

der

4079 Kal-Rez®(or equivalent) optional; others on special or-

 

 

 

 

840/860

 

 

 

(low, med, high)

316 stainless steel, 430F stainless steel, Viton O-rings

 

 

 

 

IM-83/84/86-H

 

B-3

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Sierra 860, 840, 830 instruction manual Performance Specifications, Physical Specifications
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840, 830, 860 specifications

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