Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 13)

IM 12J05D02-01E
Introduction 1-5
Logbook
Software record of important events and diagnostic data. Available through RS485, for use with the
Yokogawa PC402 communication software.
Serial Communication
Bi-directional according to the EIA-485 standard using HART-protocol and PC402 software.
1-4. Configuration checklist for DO402
Standard configuration Options Reference for change
Measured variable(s)
Primary inputs D.O. and Temp
DO range 0- 20 mg/l any span within 0-50 mg/l “range”
DO units mg/l ppm. % saturation code 56
Temperature range 0- 50 °C 25 °C minimum span “range”
Temperature unit Celsius Fahrenheit code 11
Outputs
Analog output 4- 20 mA for DO 0-20 mA or 4-20 mA code 30
Second output 4- 20 mA for Temp 0-20 mA or 4-20mA code 30
Output allocation DO and Temp DO, Temp, Table, Pl control code 31
Contact outputs S1= high at 19.5 mg/l (4) freely programmable “setpoint”
S2= low at 1.0 mg/l code 40. 41, 42, 43
Contact allocation mg/l and FAIL mg/l, temp, wash, Pl control, HOLD code 40- 43
Contact variables dead time= 0.2 s; hyst= 0.1 mg/l time: 0- 200 s; hyst 0- 20 mg/l code 44
Add. contact functions none time out alarm code 47
Control functions none Pl on contacts or mA2 output code 45, 46, 34 33
Digital outputs none RS485 code 60
Communication
Digital interface disabled RS485 code 60
Communication software disabled PC402 contact factory
Variables on display mg/l and temp %sat, °C, mA1, mA2, SL, ZR, REL “display”
Burn out disabled burn low (3.5)/ high (22) on mA1/ mA2 code 32
Password protection disabled for mains/ comm./ serv level code 52
Autoreturn return to measure in 10 minutes enable or disable code 50
Add. functions in MAINT disabled wash start/ setpoint adj code 51
Diagnostics
Membrane condition active enable or disable code 02
Check on Slope active enable or disable code 02, 22
Check on zero disabled enable or disable code 02, 21, 22
Check on stability 0.05 mg/l per 60 s 0-50 mg/l in 10-600 s code 20
Compatibility
DO Sensor DO30 DOX8, DO410, Ingold, DO70G code 01, 10
Temperature sensor Pt1000 Pt 100, PB36, 22k NTC code 10
Membrane thickness 50 µm ( 2 mil) 25 or 50 µm (1 or 2 mil), adj. slope code 01
Sensor principle galvanic galvanic or polarographic *1 code 01, “wiring”
Manual temp. comp. disabled disable or enable code 13
Special Features
Salinity compensation disabled comp. for 0- 100 ppt NaCI code 04
Temperature calibration none adjustment +/- 7.5 °C code 12
Zero calibration disabled disable or enable code 21
Sensor washing disabled interval < 36 hours, wash time 0.1-10 min. “Wash”
HOLD during maintenance disabled hold last or hold fix “Hold”
Contact during HOLD disabled possible on S1,S2, S3 or S4 code 40-42
Atm. press. compensation active active or manual
Soft fail alarm disabled possible for E1..E4, E7..E9, E12, E16, E22 code 53
Logbook disabled 2 volumes of 50 events code 61,62
*1: Choose a polarographic sensor for an optical dissolved oxygen sensor.