Explosion-proof oil-in-water monitor

The oil content is a key indicator in produced water reinjection for secondary oil recovery and wastewater discharge after treatment in oilfields worldwide. Traditionally, oil content analysis in wastewater relies on manual sampling and extraction laboratory methods. Due to production conditions and work environments, this method has low sampling frequency and long testing times, making it difficult to accurately reflect the actual oil content of wastewater, causing difficulties in processing, purification, metering, handover, and environmental monitoring. To address these issues, our company has developed an online oil-in-water monitor. This instrument uses a German-made oil content analysis chip and a far-infrared optical sensor, offering advantages such as easy installation, a wide measurement range (0-200 ppm), high detection accuracy, and high operational stability, providing accurate measurement and analysis results for wastewater treatment personnel.

The purpose of far-infrared wastewater oil content monitoring technology is to achieve online metering and monitoring of oil content in wastewater pipelines, remote data transmission, comprehensive real-time online oil content monitoring, and integration with existing digital platforms. It enables real-time remote monitoring and recording of wastewater oil content changes, meeting the needs of the production site.

The online oil-in-water monitor is specifically designed for monitoring oil-water separator units. Designed for industrial process analysis and ship bilge water alarm monitoring, its specifications and performance exceed the requirements of the International Maritime Organization's 15 ppm oil-in-water monitoring (MEPC. 107 (49)). The device provides two alarm points. The instrument provides 0(4)-20mA/RS485 signal output for connection to external data recorders.

The application of the following documents is essential. For dated references, only the dated version applies to this equipment. For undated references, the latest version (including all amendments) applies to this document.

GB/T 13384-2008 General Technical Requirements for Packaging of Electromechanical Products

GB/T 191 Packaging and Handling Marks

GB/T 11606 Environmental Test Methods for Analytical Instruments

GB/T 15464 General Technical Conditions for Packaging of Instruments and Meters

GB/T 16488 Water Quality-Determination of Petroleum and Animal and Vegetable Oils-Infrared Spectrophotometry

ST/T 5329-2012 Water Quality Indicators and Analysis Methods for Water Injection in Clastic Reservoirs

GB 50058-2014 Design Code for Electrical Installations in Explosive Atmospheres

GB 3836.1-2010 Explosive Atmospheres-Part 1: Equipment-General Requirements

GB 3836.2-2010 Explosive Atmospheres-Part 2: Equipment Protected by Flameproof Enclosures "d"

GB 3836.3-2010 Explosive Atmospheres-Part 3: Equipment Protected by Increased Safety "e"

GB 3836.8-2014 Explosive Atmospheres-Part 8: Equipment Protected by "n" Type Protection

GB 3836.15-2000 Electrical Apparatus for Explosive Gas Atmospheres-Part 15: Electrical Installations in Hazardous Locations (excluding coal mines)

GB 4793.1 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use-Part 1: General Requirements

Main System Connection Diagram

One water inlet connects to the oil-water separator outlet, and one water inlet connects to the oil-free water pipeline. The water pipe uses a 10mm outer diameter copper pipe or 316SS stainless steel pipe. It can be connected vertically to minimize the impact of bubbles. The drainage outlet should be higher than the instrument drainage outlet to ensure that the instrument pipeline is always full of water.

Usage Characteristics

(1) The monitor controller unit should have real-time data display and data storage functions, allowing for historical data retrieval.

(2) The monitor has setting, calibration, power-off protection, power-on recovery, and fault alarm functions.

(3) The monitor has data upload capabilities, and monitoring data can be uploaded to a remote data server via wired or wireless methods.

(4) This device is reliable, easy to operate, easy to maintain, and aesthetically pleasing.

(5) It does not affect the effective diameter of the original water pipeline; it will not cause pipeline blockage, and the measured values are accurate and reliable, with good long-term stability.

(6) Eliminates interference from suspended solids.

(7) This equipment can be optionally equipped with an automatic cleaning unit for the measuring tank. The automatic cleaning unit for the measuring tank can prevent instrument malfunctions caused by contamination of the measuring tank. The automatic cleaning module for the measuring tank is a cleaning valve unit that connects the measuring tank and the computer module, and automatic cleaning is performed through pneumatic operation.

(8) This instrument provides a test button for automatic alarm testing. After pressing the test button, the instrument automatically starts from a simulated high-concentration reading and decreases until the actual measured value.

(9) This device's data recorder collects and stores the following information for at least 18 months.

(10) Achieves online metering and monitoring of oil content in wastewater pipelines, remote data transmission, comprehensive real-time online oil content monitoring, and integration with existing digital platforms. It enables real-time remote monitoring and recording of wastewater oil content changes, meeting the needs of the production site.

Function Introduction

(1) Display and Alarm:

The device has two independent alarm lines, both of which can be set separately within the measurement range. The factory setting is 10 ppm. The alarm value can be set according to different site needs, but it cannot be set to a value above 200 ppm. The two alarm circuits are linked to the alarm LEDs on the front panel. The "System" LED indicates an internal error. The LED is normally a flashing green light and turns red during an alarm. The alarm LED and alarm circuit are also linked to the relay output, which can be used for external process signals or other control functions. When a power failure occurs, all three relays switch to the alarm state.

(2) Data Recording

Under alarm trigger conditions, the states of IN1 and IN2 inputs are permanently stored in the memory card. The memory card can store 18 months of operating data. After that, the oldest data will be overwritten. There is no need to replace the memory card. The contents of the memory card can be browsed and displayed. Data storage is sorted by date and time information. The instrument's time can be adjusted. When the clock is adjusted to a new setting, the data stored in the memory will restart on a new page; this means that by setting the clock, the recorded data can have multiple specific time points. Normally, no data is lost.

(3) Parameter Adjustment

The online oil-in-water monitor is set according to the factory specifications; two alarms, one set to 10ppm, and the other set to 50ppm. The zero point of the online oil-in-water monitor can be adjusted. At the work site, use clean water to pass through the measuring instrument and readjust it through the buttons on the front panel.

(4) Main Structure

① Calculation Unit

② Measurement Unit

③ Dryer

④ Top Cover (excluding the top cover of the cleaning unit and the automatic cleaning unit)

The calculation unit contains a display circuit board, data recording, and a main circuit board containing connection terminals. The measurement unit is an electroplated aluminum housing, and the water inlet and outlet ports are made of stainless steel. It contains electronic optical components and is connected to the calculation unit via a data cable. The relative positions of the two components are determined according to the actual on-site conditions. The instrument or all components are installed on a stainless steel base plate for easy fixing and installation. Of course, if the installation space is limited, the components can be installed separately. The maximum distance between the calculation unit and the measurement unit is 5 meters.