What to do if JENCO 6308PT Controller shows 'OVER' and pH is greater than 16.00?
If the JENCO Controller displays 'OVER' and the pH reading exceeds 16.00, it indicates an over range condition. You should either recalibrate the device.
What to do if JENCO 6308PT Controller displays 'OVER' with high mV offset?
If the JENCO Controller displays 'OVER' with a high mV offset (Offset @ 7.00pH: mV>100mV or Offset@6.86pH: mV>108.3mV) or if the new slope exceeds the ideal slope by 30%, use a new buffer solution. If the problem persists, replace the electrode.
What to do if JENCO 6308PT displays 'UNDR' with low mV offset?
If the JENCO Controller displays 'UNDR' with a low mV offset (Offset @ 7.00pH: mV
What to do if JENCO Controller displays 'OVER' because of low temperature?
If the JENCO Controller displays 'OVER' and the temperature is less than -10.0°C, bring the buffer or solution to a higher temperature.
What to do if my JENCO Controller shows 'EEPROM: BAD'?
If your JENCO Controller displays 'EEPROM: BAD', turn the instrument off and then back on again. If the issue persists, return it for service under the warranty.
What to do if my JENCO Controller shows 'ROM : BAD'?
If your JENCO Controller displays 'ROM : BAD', turn the instrument off and then back on again. If the issue persists, return it for service under the warranty.
What to do if my JENCO 6308PT shows 'RAM : BAD'?
If your JENCO Controller displays 'RAM : BAD', turn the instrument off and then back on again. If the issue persists, return it for service under the warranty.
Details on how to cut out a panel and mount the controller unit.
Steps for safely cleaning the instrument using a lint-free cloth and mild detergent.
Describes the functions of the keys on the front panel of the 6308PT model.
Describes the main display mode, showing temperature and pH measurements.
Details the password entry screen for accessing settings and calibrations.
Describes the user setting page and the "FROZEN" state of relays/analog output.
Step-by-step guide for performing pH calibration using buffer solutions.
Configuration of pH relays, including set points and hysteresis for control actions.
Settings related to the 4-20mA output, including 4mA, 20mA values and output type.
Settings for temperature control, including relay action, set point, and hysteresis.
Specifies the maximum isolation voltage for relay output contacts.
Details the maximum current rating for relay output contacts to prevent damage.
Defines relay action types (HIGH/LOW), set points, and hysteresis modes (CENTER/EDGE).
Describes the four independent alarm channels for pH display and their control logic.
Specifies the maximum isolation voltage for the 4-20 mA output.
Specifies the maximum load impedance for the 4-20 mA output.
Explains the linear analog output equation for pH measurement based on settings.
Explains the antilog analog output equation for pH measurement.
Assumes familiarity with data communication and introduces the RS485 interface.
Instructions on connecting the meter to a PC via the RS485 interface for data reading.
Instructions and requirements for returning items for service or repair.
The Jenco Model 6308PT is a robust, microprocessor-based pH and Temperature System, designed for use in laboratories and process control applications. Housed in a watertight 1/4 DIN case, this instrument offers comprehensive monitoring and control capabilities for pH and temperature measurements.
The primary function of the 6308PT is to simultaneously display pH, temperature, alarm status, and current output on a single LCD graphic screen. It utilizes a glass electrode for pH measurement and a precise thermistor for temperature readings, ensuring accuracy across all measurements. The system is equipped with a backlight for enhanced visibility in dark environments.
A key feature of the 6308PT is its advanced control capabilities, facilitated by five relays. These include two active Low and two active High relays for pH control, and one programmable high or low relay for temperature. All relays are hysteresis-driven and can be configured in either CENTER or EDGE mode, offering flexible control over process parameters.
The instrument also provides an isolated 4-20mA analog output, which is configurable for offset and span, allowing for precise integration into various control systems. Furthermore, the 6308PT includes an RS485 interface, enabling users to easily log data from multiple 6308 units to an IBM® PC/AT compatible computer, facilitating comprehensive data acquisition and analysis.
The 6308PT is designed for user-friendly operation with its intuitive front panel and clear display. Upon power-on, the unit performs a self-diagnostic routine, providing basic information about its stability. The main display mode shows real-time pH, temperature, efficiency of the pH electrode, and the actual output of the 4-20mA circuit.
Accessing the Calibration/Setting mode is done by pressing the [CAL/VIEW] key for about 2 seconds from the main display. This mode provides access to several pages for configuring the instrument:
The relays operate based on set points, action types (HIGH/LOW), hysteresis mode (Center/Edge), and hysteresis value. For example, in HI action with CENTER mode, the relay turns ON at [(RELAY SETPOINT) + (0.5 * hysteresis value)] and OFF at [(RELAY SET POINT) - (0.5 * hysteresis value)].
The analog output can be linear or antilogarithmic, depending on user selection. The linear output is calculated based on the current pH display and the pH values set for 4mA and 20mA. The antilog output uses a similar calculation involving powers of 10.
The 6308PT features a 2-wire RS485 interface for data communication. Users can connect the meter to a PC and program a routine to read data, with sample programs provided to assist in integration.
Upon receipt, users should carefully unpack and inspect the instrument for any shipping damages. All packing materials should be retained until satisfactory operation is confirmed. The mounting procedure involves making a panel cutout, inserting the controller, and securing it with a mounting bracket.
Before cleaning, the power must be removed. The instrument should be wiped with a lint-free cloth and clean water or a neutral detergent. Only the outer surface should be cleaned, and it must be thoroughly dried before reapplying power.
The instrument provides various error messages to assist in troubleshooting:
The instrument stores temperature characteristics for common pH calibration buffers (4.00, 4.01, 6.86, 7.00, 9.18, and 10.01). It is crucial that the buffers used for calibration exhibit the same temperature characteristics as the stored values for accurate calibration. A table is provided showing the pH values of these buffers at various temperatures from 0°C to 60°C. The actual reading may differ by ±0.01 pH from these values.
The Jenco Model 6308PT is designed for reliable and precise pH and temperature control, with features that support both routine measurements and complex process management.
General| Model | 6308PT |
|---|---|
| Category | Controller |
| Measurement Parameters | pH, ORP, Temperature |
| Power Supply | 100-240 VAC, 50/60 Hz |
| Operating Temperature | 0 to 50 °C |
| Display | LCD |
| Outputs | 4-20 mA, Relay |
| Weight | 0.5 kg |
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