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pH/mV-Controller - H9922
 

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. 

 

H9922

 

Technical Data 

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 3-digit
Character height 12.7mm
Temperature drift Max. 50mV/C

Max. humidity

none condensing 

Input impedance

1000GW (1012 W)

Input bias current

Max. 1.5pA

Pt-100 or manual button

Temperature compensation by Pt-100 3-wire, or by hand.

Temp. button

Display the actual temperature

Auto / manual button

Relay contact automatically/manually

+ / - button

to increase or decrease values

pH7 button

Calibrate the probe at isotherm 7pH

mV/pH button

Calibrate the probe at straight pH values

Programming 

Program switch positions 

Functions

ON

OFF

1

LED 1 inverse

LED 1 normal

2

LED 2 inverse

LED 2 normal

3

REL 1 N/O, open

REL 1 N/O, closed

4

REL 2 N/O, open

REL 2 N/O, closed

5

2...12pH

0...14pH

6

4...20mA

0...20mA

7

not used

8

not used

Option signal current output

0/4...20mA, galvanically isolated, max. load 500W, output impedance typical >1MW

Relay contact

Adjustable over the full pH or mV range

Hysteresis

15 digit

Relay contact status

Displayed by green LED-lamps

Relay contact output

Floating change over contacts, max. contact load 2A@230VAC, inductive or 6A@230VAC, resistive

Power supply

230V 50-60Hz 

CE-Conformity

Fulfilled

pH/mV-plug

13mm DIN-plug with teflon insulation

Terminals

2 plug-in screw terminals for supply, limit contacts and signals

Cut out

91 mm x 91 mm, Depth 158 mm.

Weight

620 grams

Accessories

2 mounting clamps,1 manual

 

Wiring 

 

Terminal

Description

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