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Product

pH/rH(mV)-controller type M3020

Product code: M3020
Category: pH, rH
QTY:
hotro

Minh Quan Technology Joint Stock Company

Hotline: 01692 114 683

Mr Que: 0973 852 363

Ms Ha: 0165 2197 433

Email: mqtekvietnam@gmail.com

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Product information

  • Back lighted graphic display
  • Programmable
  • Temperature compensation up to 120ºC
  • USB data logger
  • 2 limit contacts
  • Alarm function with change-over contact
  • Programmable signal current output  0…20mA, galvanically isolated
  • Power supply 20…253VAC/DC, galvanically isolated
  • Compact dimensions
  • Flush mounting
  • Optionally: Voltage output, galvanically isolated
  • Optionally: Up to 5 change-over contacts
  • Optionally: RS485 interface
  • Optionally: IP66 protection
    Product Details

    The highly compact pH/rH(mV)-controller type M3020 has been developed for simple process control and monitoring applications in electrometry. The back lighted graphic display is readable from distance and enables self explaining activation of the functions.

    Basically, the instrument is a simple two-point controller, consisting of an electrometer amplifier and two floating change-over contacts which are adjustable over the entire measuring range and the two change-over contact are used e.g. for alarm units, metering valves and pumps, etc.

    A graphic display continuously indicates the actual value, temperature and instrument status. 4 LEDs informs about the status of the change-over contacts, temperature and alarm.

    The wide range power supply, from 20 to 253VAC/DC, supplies the instrument. A pH-sensor only is needed for minimal operation.

    The temperature compensation of the pH-signal can be set to manual or external. A Pt-100 platinum temperature sensor in the reactor compensates the pH-signal. Broken sensor wires are indicated immediately and this error condition activates the alarm contact. Alarm settings are programmable.

    The instrument settings can be protected with an access code. A USB memory stick, used as a data logger on the back of the instrument, may log all values. Optional, a signal current output with galvanic isolation is available.

    The choice of probe electrodes for the controller isn’t critical, but for each application the appropriate sensor must be selected. Analogue und digital sensors can be used. The electrode can be calibrated anytime with the user friendly menu.

    Typical applications:
    Simple monitoring with alarm annunciation when the preset thresholds are exceeded. The controller is used for routine monitoring of environmental, pollution and other applications.

Specifications

Measuring range: 0,00 to 14,00pH               -1000 to +1000mV
Resolution: 0,01pH                                    1mV
Accuracy: 0,01pH                                    3mV
Long Term stability, 1 year: 0,02pH                                  6mV (max. per year at 23°C)
Display: LCD 128×128 Pixel
Pixel size 0.4×0.4mm
Temperature drift: Max. 50mV/°C
Max. humidity: non condensing
Input impedance: 1000GW (10 W)
Input bias current: Max. 1,5pA
Temperature: -3.0…120.0°C temperature compensation by Pt-100, 3-wire, or by hand.
Relay control: Switchable between automatic / manual in the main screen by pressing F4
ENT key: quick access to the settings in the Main Screen save / parameters / …
ESC key: ESC key: access to the main menu (press and hold the Main Screen 3sec) / exit menu item
+ / – key: value settings / control relay / …
F1 / F2 key: control relays 3 and 4 on the main screen
F3 key: calibrating of the probe on the main screen
F4 key: to increase or decrease values
Programming functions: adjustable caption display and various setting options via software
Input variant: Analog and digital ISM InPro (3250i,3253i,4260i,4800i…) or Analog and 2-wire transmitter (M2920)
Option 2-wire transmitter: 20V/24mA, range: 4…20mA = -1000…+1000mV
Signal current output: 0…20mA, galvanically isolated, adjustable over full range
Max load: 500W
Output impedance: typ. >1MW
Limit values: 0…14pH, adjustable over the full range
Hysteresis: 5 – 200 digits adjustable
Limit value status: displayed with green lamps for contact 1/2, no lamps for optional contact 3/4
Relay outputs floating changeover contacts, Max. 6A, 2A at 230V continuous, inductive
Alarm functions: 2 programmable switching thresholds, Pt-100 alarm if wires are broken, 1Wire alarm if wires are broken and USB alarm if the stick/media is full. The alarm is displayed with the red lamp and on the display. Alarm can be acknowledged.
Alarm relay: same specifications as above
USB: logger function, programmable log-term (sequence: 1-7200 sec). Use only FAT32 formatted, empty USB flash drives. Stop logging before removing the stick.
Supply: 20..253VAC/DC, up to 3W
CE-conformityt: confirmed
Terminal strip: plug terminals on the back panel
pH/mV socket: 13mm DIN socket with Teflon insulation / BNC available on request
Weight: 304g
Equipment: 2 quick-mounting brackets

1 operating instructions with wiring diagram

Warranty: 2 years

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