PART ONE - INTRODUCTION
SECTION 2 - SPECIFICATIONS
Accu4™ Low-range Turbidimeter System
Rev. 2-300
18
Mechanical
2.3 Accu4™ Turbidimeter
System Performance
(electrical, analog outputs)
Alarm ...........................Settings for low alarm point, low alarm point
deadband, high alarm point, high alarm point
deadband, off delay, and on delay
Status ....................... Setting for FAIL, WARN or ALL system diag-
nostic conditions to activate relay when
specific conditions exist (analyzer, light source
1/2 or detector 1/2 failure, sensor chamber
dirty or sensor chamber unknown)
Indicators...........................Relay annunciators (A, B, C, and D) indicate
respective relay on/off status
Sensor-to-Analyzer Distance ...... 30 ft. (9 m) maximum (consult factory if
longer distances are required)
Power Requirements .................. 90-130 VAC, 50/60 Hz. (10 VA max.) or
180-260 VAC, 50/60 Hz. (10 VA max.)
Calibration Methods:
PRIMARY ............................... Enter one primary standard value (formazin
suspension is recommended).
CUBE CAL ............................. Temporarily insert an optional Cal-Cube
TM
assembly into the sensor and enter its factory-
certified standard value.
SAMPLE................................. Enter one sample value determined by labo-
ratory analysis or calibrated portable meter.
Analog Outputs .......................... Two isolated 0/4-20 mA outputs; each with
0.004 mA (12-bit) resolution and capability to
drive up to 600 ohm loads
NOTE:
Each output represents the measured turbidity. Turbidity values can
be entered to define the endpoints at which the minimum and maxi-
mum mA output values are desired. During calibration, both outputs
can be selected to hold their present values, transfer to preset val-
ues to operate control elements by an amount corresponding to
those values, or remain active to respond to the measured turbidity.
Communication: RS-232 ........... Enables configuration and retrieval of measured
data for one analyzer using an IBM-compatible
PC and optional GLI software tool kit
HART.............. Enables configuration and retrieval of measured
data for up to 15 analyzers over communication
link using appropriate hand-held terminal or data
system with HART software
Memory Backup (non-volatile) .... All user settings are retained indefinitely in
memory (EEPROM)
EMI/RFI Conformance................ Meets European standards for conducted and
radiated emissions and immunity; certified CE
compliant for applications as specified by EN 50081-1
for emissions and EN 50082-2 for immunity
Electrical Certifications:
General Purpose (pending) ..... UL, C-UL, FM, and CENELEC
Division 2 (pending) ................ UL, C-UL, and FM: Groups A, B, C, D, F, and G
Zone 2 (pending) .................... CENELEC: Group IIC
Enclosure................................... NEMA 4X; polycarbonate face panel, epoxy-
coated cast aluminum door and case with
four 1/2 inch (13 mm) conduit holes, nylon
mounting bracket, and stainless hardware
Mounting Configurations............. Panel, surface, and pipe mounting
Net Weight ................................. 5 lbs. (2.3 kg) approximately
System Accuracy ....................... ± 2% of reading, all ranges
Sensitivity .................................. 0.001 NTU
Repeatability .............................. 0.1% of span or better
Temperature Drift ....................... Zero and Span: 0.01% of span per
°
C
