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DOE-45PA/DOTX-45 Dissolved Oxygen System Part 1 – Introduction

DOTX-45 5 -

• AC power option provides dual SPDT relay operation and one additional isolated

analog output. Software settings for relay control include setpoint, deadband,

phase, delay, and failsafe. Software controls automatically appear in menu list

when hardware option card is plugged in and system power is applied.

• Selectable PID controller on main analog output. PID controller can operate with

instrument configured as loop-power transmitter, or as one of the two outputs on

the AC powered instrument. PID includes manual operation feature, and

diagnostic “stuck-controller” timer feature for relay notification of control

problems.

• Two analog outputs on the relay version may be configured to track oxygen and

temperature, or oxygen and oxygen. Both analog outputs can be individually

programmed to fail to specific values.

• Selectable Output Fail Alarm feature on Relay B allows system diagnostic

failures to be sent to external monitoring systems.

• Large, high contrast, custom LCD display with LED back light provides excellent

readability in any light conditions. The secondary line of display utilizes 5x7 dot

matrix characters for clear message display two of four measured parameters

may be on the display simultaneously.

• Diagnostic messages provide a clear description of any problem with no

confusing error codes to look up. Messages are also included for diagnosing

calibration problems.

• Quick and easy one-point calibration method, air calibration method, and sensor

zero-cal. To provide high accuracy, all calibration methods include stability

monitors that check temperature and main parameter stability before accepting

data.

• High accuracy three-wire Pt100 temperature input. Temperature element can be

user calibrated.

• Security lock feature to prevent unauthorized tampering with transmitter settings.

All settings can be viewed while locked, but they cannot be changed.

• High reliability, microprocessor-based system with non-volatile memory back-up

that utilizes no batteries. Low mass, surface mount PCB construction containing

no adjustment potentiometers. All factory calibrations stored in non-volatile

EEPROM.

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