8 Combined ORP electrode optionally
9 Temperature sensor optionally
10 Hydropanel HP-4122 optionally
11 Hydropanel HP-4122. Instruction manual
12 Discrete signal output unit БВД-8.2 optionally
13 Discrete signal output unit БВД-8.2. Instruction manual optionally
14 Discrete signal output unit БВД-8.2. Passport optionally
15 pН meters industrial рН-41. Test procedure 1
16 pН meters industrial рН-41. Calibration procedure 1 optionally with
ORP measuring
Example of the order:
« рН-4122. — pH meter industrial dual channel». Additionally is indicated the
number of the measurement channels (one or two), the specific measurements ranges, the
output signals ranges, the types of pH electrodes.
5 Arrangement and principle of operation
5.1 Arrangement of transmitter
5.1.1 The pH meter transmitter is an electronic unit placed in the housing.
5.1.2 The electronic unit consists of two printed circuit boards: display board and the
main board, connected to each other by means of a flat cable.
5.1.3 The main board has a power supply and sensors connectors, analog outputs and a
measuring part galvanically isolated from the supply line on.
5.1.4 The display board has a power voltage converter, display and digital interface
controls.
5.1.5 The front panel (Appendix B) has the following elements:
– graphic LCD display with LED-backlit display of the measured value and the set
parameters;
– two-color LED single interface indicator (RS);
– LED single red indicator to inform about the selected alarm settings (1, 2, 3, 4);
–{- left, return, cancel;
–я- up, right to the figures positions;
–ч- down, and number increase;
–}- right, selection and left with the fixation.
5.1.6 The meter is a microcontroller device. The first microcontroller processes a signal
from the sensors providing analog-to-digital conversion. The second microcontroller
provides a keyboard control, indicators and data exchange over a local network.
5.1.7 In the presence of the interface it is possible to read the measurement results and
device control over the local Modbus network. The meter display has a priority in
control device.
5.1.8 To prevent an unauthorized adjustment or tampering impairing the measurement
results the analyzer body cover may be sealed.
Instruction manual PH-ME ER Industrial 4122.P 9
