Emerson Process Management 3081 pH/ORP Accessories, Year 2000 Compliance Millennium Status

MODEL 3081 pH/ORP	SECTION 1.0
	DESCRIPTION AND SPECIFICATIONS

CALIBRATION: Two-point, temperature-corrected buffer calibration is standard. To reduce errors caused by impatient operators, the Model 3081 pH/ORP transmitter does not accept calibration data until programmed stabil- ity limits have been met. If data are not acceptable, the transmitter displays an error message and does not update the calibration. The transmitter recognizes every buffer scale in common use in the world. Manual two- point and one-point calibration are also available.

AUTOMATIC TEMPERATURE COMPENSATION: Temperature compensation is completely automatic. The Model 3081 pH/ORP transmitter is compatible with two, three, and four wire Pt 100, Pt 1000, and 3K Balco RTDs.

SOLUTION TEMPERATURE COMPENSATION: The Model 3081 pH transmitter features solution temperature compensation. The transmitter calculates and displays the pH at 25°C from the pH measured at any tempera- ture. The temperature coefficient of the liquid being measured must be known.

SENSOR DIAGNOSTICS: Continuous diagnostics alert the user to impending or existing sensor failure. Diagnostic messages in plain language aid in trou- bleshooting. The manual contains a thorough, step-by- step troubleshooting guide.

HOUSING: The Model 3081 pH/ORP transmitter hous- ing meets NEMA 4X standards. The transmitter tolerates outdoor and harsh plant environments. The housing also meets NEMA 7B explosion-proof standards.

HAZARDOUS AREA INSTALLATION: Circuits in the Model 3081 pH/ORP transmitter are designed and built to be intrinsically safe when used with the appropriate safety barrier.

OUTPUT: The 4 to 20 mA output signal is fully adjustable between 0 and 14 pH and between -1400 and 1400 mV. During hold and fault conditions the out- put can be programmed to remain at the last value or go to any value between 3.8 and 22 mA.

1.2 ACCESSORIES

1.2.1Power Supply. Use the Model 515 Power Supply to provide the dc loop power required by the Model 3081 pH/ORP transmitter. The Model 515 provides either a single source of power at 48 Vdc and 200 mA or two iso- lated sources at 24 Vdc and 200 mA each. A junction box (PN 2002188) allows as many as nine 3081 pH/ORP transmitters to be powered from each output. For more information refer to product data sheet 71-515.

1.2.2Alarm Module. The Model 230A Alarm Module receives the 4-20 mA signal from the Model 3081 pH/ORP transmitter and activates two alarm relays. Specify alarm configuration at the time of ordering. High/high, low/low, and high/low are available. Dead band is adjustable as high as 15% of full scale. For more information, refer to product data sheet 71-230A.

1.2.3Model 275 HART® COMMUNICATOR. The Model

3081 pH/ORP transmitter is compatible with the Model

275 HART communicator. The HART Communicator allows the user to view pH or ORP, temperature, and current output. The user can also program and configure the transmitter and can download data for transfer to another transmitter or computer. The Model 275 commu- nicator attaches to any wiring terminal across the output loop. A 250 ohm load must be between the power supply and the transmitter. Order the Model 275 communicator from Rosemount Measurement. Call (800) 999-9307.

Year 2000 Compliance: Millennium Status

Rosemount Analytical , Uniloc Division, certifies that all instruments designed and manufactured by the Uniloc Division, do not have calendars. No instruments manu- factured by Uniloc Division keep track of days, months, or years. This has been validated by reviewing all test and calibration procedures. In calibrating and setting up instruments for shipping, there is no step in any proce- dure to enter a date.

2