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pH/mV-Controller - H9922 |
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The pH/rH(mV)-controller type H9922 has been developed especially for applications which, until now, could not be monitored and controlled automatically due to cost. But now, the new H9922 offer these features as standard. The two-point controller is a basically simple device, consisting of an electrometer amplifier and two floating change-over contacts which are electronically adjustable over the entire measuring range. The instrument requires a 115-230V supply and is used as a simple indicator by connecting electrodes. It has automatic temperature compensation with a Pt-100 platinum sensor and automatic pH-electrode calibration. The galvanically isolated, programmable signal current output is connected to a remote display, recorder, computer, or any other desirable data sampling device. By using the alarm contacts, the controller activates dosing valves, pumps, alarm devices, etc. The heavy duty switching relays withstands currents up to 6A; however, for longer contact life, the current should be limited to 2A.
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H9922
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Technical Data |
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Measuring ranges | 0.00 to 14,00pH | -1000 to +1000mV | |||
Resolution | 0.01pH | 1mV | |||
Accuracy | 0.01pH | 3mV | |||
Long term stability, 1 year | 0.02pH | 6mV | |||
Display | Red LED-display 3½-digit | ||||
Character height | 12.7mm | ||||
Temperature drift | Max. 50mV/°C | ||||
Max. humidity |
none condensing | ||||
Input impedance |
1000GW (1012 W) |
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Input bias current |
Max. 1.5pA |
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Pt-100 or manual button |
Temperature compensation by Pt-100 3-wire, or by hand. |
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Temp. button |
Display the actual temperature |
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Auto / manual button |
Relay contact automatically/manually |
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+ / - button |
to increase or decrease values |
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pH7 button |
Calibrate the probe at isotherm 7pH |
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mV/pH button |
Calibrate the probe at straight pH values |
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Programming |
Program switch positions |
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Functions |
ON |
OFF |
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1 |
LED 1 inverse |
LED 1 normal |
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2 |
LED 2 inverse |
LED 2 normal |
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3 |
REL 1 N/O, open |
REL 1 N/O, closed |
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4 |
REL 2 N/O, open |
REL 2 N/O, closed |
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5 |
2...12pH |
0...14pH |
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6 |
4...20mA |
0...20mA |
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7 |
not used |
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8 |
not used |
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Option signal current output |
0/4...20mA, galvanically isolated, max. load 500W, output impedance typical >1MW |
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Relay contact |
Adjustable over the full pH or mV range |
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Hysteresis |
15 digit |
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Relay contact status |
Displayed by green LED-lamps |
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Relay contact output |
Floating change over contacts, max. contact load 2A@230VAC, inductive or 6A@230VAC, resistive |
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Power supply |
230V 50-60Hz |
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CE-Conformity |
Fulfilled |
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pH/mV-plug |
13mm DIN-plug with teflon insulation |
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Terminals |
2 plug-in screw terminals for supply, limit contacts and signals |
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Cut out |
91 mm x 91 mm, Depth 158 mm. |
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Weight |
620 grams |
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Accessories |
2 mounting clamps,1 manual
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Wiring |
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Terminal |
Description |
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1 | Pt-100 sense - | ||||
2 | Pt-100 - | ||||
3 | Pt-100 + | ||||
4 | PE for Pt-100/output | ||||
5 | Signal current output + | ||||
6 | Signal current output - | ||||
7 | Contact 1 norm. open | ||||
8 | Contact 1 norm. closed | ||||
9 | Contact 1 change over | ||||
10 | Contact 2 norm. open | ||||
11 | Contact 2 norm. closed | ||||
12 | Contact 2 change over | ||||
13 | Protective earth PE | ||||
14 | Supply voltage N | ||||
15 |
Supply voltage L1 |