ECD

CA900 Sulfide Ion Analyzer

Compact online sequential sampling analyzer for the automatic measurement of total sulfide ions in water.

Uses a sulfide ISE with pH adjustment and acid neutralization for safe waste disposal
Standard 6-minute analysis cycle with minimal reagent usage (1 ml caustic and 1 ml acid per cycle)
Touchscreen interface with 4-20 mA outputs, standard wall mounting, and simple tubing setup

Quantity

Overview

The ECD CA900 Sulfide Ion Analyzer is a compact, all-in-one system for continuous, automated sulfide ion measurement in municipal water, wastewater, and industrial process streams. Utilizing a sulfide ion selective electrode (ISE) with integrated pH conditioning and post-measurement acid neutralization, it ensures precise, eco-friendly monitoring across a broad 0.02 to 500 ppm range. Featuring programmable analysis cycles, an intuitive touchscreen interface, flexible 4-20 mA outputs, and configurable alarm relays, the CA900 provides robust, low-maintenance operation for critical discharge and water quality compliance.

Typical Applications

Municipal Wastewater (treatment plants and monitoring)
Well Water
Refineries (petroleum/chemical wastewater streams)
Tanneries
Chemical Plants
Paper and Pulp Facilities

Key Features

Compact all-in-one measurement system – Conditions the sample, measures sulfide, neutralizes the sample, measures pH, drains, and rinses the cell
ISE based sulfide ion measurement – Provides a wide measurement range from 20 ppb to 500 ppm using economical, replaceable electrode cartridges
pH adjusted and compensated measurement – The sample is optimized for the sulfide ion measurement at high pH values.
Sample neutralized after measurement – The highly caustic sample pH is reduced to a safer level near pH 8.

Benefits

Touchscreen interface – User-friendly menus and configuration screens with separate electronics and hydraulics/liquids compartments.
Low reagent consumption – At 10 samples per hour the analyzer uses less than 2 gallons per month of KOH and an equivalent amount of HCl; at 2 samples per hour reagent use is about 5 months per set.

Specifications

MEASUREMENT
Measured parameter	Sulfide Ions (S²⁻ / Total Sulfide)
Measuring principle	Sequential sampling, Sulfide Ion Selective Electrode (ISE), pH compensated measurement, sample neutralization
Measuring range	0.02…500 mg/L (0.02…500 ppm)
Measuring temperature range	-5…50 °C (20…120 °F)
Accuracy	±20 ppb or ±5% of reading, whichever is greater
Repeatability	±2% of reading
Cycle response time	6, 12, or 30 minutes, user selectable

SAMPLE & STREAMS
Sample requirements	Pressure: Drawn from atmospheric pressure Flow rate: >100 mL/min Temperature: 10…50 °C
Hydraulic connections	Sample Inlet: ⅛ in ID tubing barb fitting Drain Outlet: ¼ in ID tubing barb fitting
Reagents	16% Potassium Hydroxide (KOH), 7.5% Hydrochloric Acid (HCl / Muriatic Acid)
Reagent consumption	6 min cycle time: 7.2 L/month (1.9 gal) each 12 min cycle time: 3.6 L/month (0.95 gal) each 30 min cycle time: 1.5 L/month (0.4 gal) each

ELECTRICAL
Power requirement	100/240 VAC, 50/60 Hz, switch selectable
Analog output	Four 4…20 mA outputs
Alarms	4 configurable relays SPDT 15A 250VAC
Data logging	Configurable data recording, storage, and output
Connections	2 x 4…20 mA, Line Neutral and Ground for power. All connections are to a terminal strip, access through IP65 ½ in cable glands

PHYSICAL & ENVIRONMENTAL
Dimensions (L x H x D)	43 x 81 x 23 cm (17 x 32 x 9 in)
Weight	Approx. 14 kg (30 lbs)
Operating conditions	Temperature: 10…50 °C (Operating Temperature: 5…50 °C) Humidity: 5 to 95% non-condensing humidity
Enclosure & Cabinet	Non-metallic gray hot-molded fiberglass reinforced polyester, transparent polycarbonate cover with non-metallic hinges
Mounting	Wall mounting or with optional bench support
Protection degree	NEMA 4X, IP66-11