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Series 830/840/860 Instruction Manual Appendix B Specifications
IM-83/84/86-H B-3
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
4079 Kal-Rez
®
(or equivalent) optional; others on special or-
der
840/860
(low, med, high).............316 stainless steel, 430F stainless steel, Viton O-rings