Bürkert Modular Analysis Transmitter for PH, ORP, Conductivity Measurement

The 8285 modular process analysis system is designed to measure and process liquid analysisparameters. The base unit contents the power supply, signal outputs, binary inputs and the front with graphic display with backlighting. Three slots are available, which depending onthe applications can be occupied with modules for pH, conductivity or also with a module with additional outputs. The hygienic, polished stainless steel enclosure version allows application in the field of bio technology, food processing, and in the pharmaceutical industry. Further applications in thechemical industry, environmental engineering, water and waste-water treatment, and for application in power plants are also possible.

Device self-test

Test of RAM, FLASH, EEPROM, display Binary input OK 2 Galv. separated (OPTO coupler); Vi ≤ 30 V, and keypad, record for QM documentation floating, galvanic isolation up to 60 V...

Clock

Real-time clock with date; second parameter set Power reserve: approx. 1 year (lithium battery) Switching voltage 0...2 V AC/DC inactive, 10...30 V AC/DC active

Data retention

Parameters and factory settings > 10 years (invertible)

Module slots

3 Overrange* 22 mA in the case of a message

Electrical connection

Terminals via 5 x M20 x 1.5 cable glands Signal deviation1) < 0.2% current value + 0.02 mA Current source 0.00...22.00 mA

Connection cable

Single wires and flexible leads up to Current output I2 0/4 ... 20 mA (22 mA), max. 10 V, 2.5 mm2 (AWG 14) galvanic isolation up to 60 V Ground wire: 2.5 mm2, screw M4...

Power supply

24 (–15 %)...230 (+15%) V AC/DC; Signal deviation1) < 0.2% current value + 0.02 mA approx. 10 VA/10 W Current source 0.00 ... 22.00 mA

Overvoltage category

II Switching contacts* 4 relay contacts K1 ... K4, floating,

Protection class

I galvanic isolation up to 60 V

Pollution degree

2 (EN 61010-1) K1, K2, K3 are connected on one side

Protection against

Protective connection according to Loadability DC: < 30 V / < 500 mA, < 10 W

Binary input OK 1

Galv. separated (OPTO coupler); Vi ≤ 30 V, nance request /function check, limit values, floating, galvanic isolation up to 60 V parameter set 2 active, rinsing contact,

Function

switches the device to HOLD mode USP contact, K4 permanently set as alarm (function check) contact (NAMUR failure)

Switching voltage

0...2 V AC/DC inactive, 10...30 V AC/DC active * User-defined (invertible) 1) To IEC 746 Part 1, at nominal operating conditions

Technical data - 8285

pH/ORP module

Measurement range

Sensor standardization 1-/2-/3-point calibration (best fit line)

ORP value

2000...+2000 mV •Calimatic® automatic buffer recognition

Glass electrode input1)

Input resistance: > 1x 1012 Ω Drift check* Fine / standard / coarse Input current3): < 1 x 10-12 A Calimatic® buffer sets* •Fixed buffer sets: Input range: 0.5 ... 1000 MΩ 1-...

Signal deviation1) 2)

pH value: < 0.02 ; TC < 0.001 pH/K •Manually enterable buffer set with max. three

Temperature input

Pt100 / Pt1000 / NTC30 kΩ / NTC 8.55 kΩ Nom. zero* pH 0 ... 14; calibration range ΔpH = ± 1 3-wire connection, adjustable Nom. slope (25°C)* 25 ... 61 mV/pH; calibration range...

Resolution

0.1°C Zero point, slope, Uiso, response time,

Signal deviation 1) 2)

0.2 % meas. value + 0.5 K (< 1 K with NTC > 100°C) calibration process with date and time p. 2/12 8285

Technical data - output

module

Current output I3

0/4 ... 20 mA (22mA), floating Threshold outputs 4 electronic relay outputs, polarized

Supply voltage

3 ... 30 V, Imax = 100 mA, Pmax = 0.8 W Voltage drop < 1.2 V

Load monitoring

Error message if load is exceeded Loadability DC: Vmax = 30 V; Imax = 100 mA; Pmax = 0.8 W

HS Code

9027.80

• Burkert 8285
• Buerkert 8285
• Bürkert 8285
• Type 8285
• Burkert Type 8285