Dissolved Oxygen Transmitter

Transcription

1 Dissolved Oxygen Transmitter OBM-67H The OBM-67H is a -wire type (4VDC power supply) dissolved oxygen transmitter housed in a robust, die-cast aluminum enclosure suitable for installation out in the field. This model is equipped with a wide range of useful features, such as HART communication. Features HART communication (version 7) supports the transmission of digital data such as DO measured value, temperature measured value, and equipment status commands. CE mark compliant. Freely adjustable transmission output range. When maintenance mode is enabled, the ST-BY indication is on. In maintenance mode, the output signal is held at the value which was set before the mode was enabled. The instrument can also be configured to automatically return to measurement mode. This feature is especially useful when the instrument is inadvertently left in maintenance mode. The instrument is equipped with a burn-out function. When the self-diagnostics function detects an error in the measurement system, such as a computer error or the failure of the temperature compensation resistor, the burn-out function provides notification of the problem by causing the transmission output to go offscale (upper or lower limit). The instrument automatically judges the quality of electrode characteristics during calibration, and provides diagnostic information in the form of error messages. The system is equipped with a salinity compensation function. System configuration Electrode lead ELW-3 Transmitter OBM-67H Site Instrument room ~m Distributor Receiver Extension cable OC type Detector Junction box FC-4 EC- (max.m) The junction box and extension cable are used when the length of the electrode lead ELW-3 (~ m) is insufficient. Power/transmission output line (4~mADC) HART communicator DC power Indicator Recorder Controller DCS, etc.

2 Standard Specifications Product Name Measurement range Performance (excluding detector) Temperature compensation Indication Operating power and power consumption : Dissolved oxygen transmitter : OBM-67H : Dissolved oxygen;.~5.mg/l (Minimum indication;.mg/l) O;.~3.% (Minimum indication;.%) SAT;.~.% (Minimum indication;.%) Temperature; -.~. C (Minimum indication;. C) (Transmission output signal is provided for DO only.) : DO linearity; Within ±%FS (~mg/l range or less; within ±.5mg/L) (by equivalent input) DO repeatability; Within ±.8%FS (~mg/l range or less; within ±.5mg/L) (by equivalent input) : Compensation range; ~45 C Compensation accuracy; Within ±3%FS (equal input) : LCD (4 digit display*) : -wire system, 4VDC, (8~3VDC with load resistance *),.6VA or less Transmission output range Transmission output Control operation : Dissolved oxygen; The upper limit range can be adjusted in. mg/l increments within a range of.~5. mg/l. : 4~mADC, isolated. Max. load resistance; 5Ω : Microcomputer Ambient conditions : -~55 C, 95%RH or less (During Construction transport: -3~65 C, 98%RH or less) Dimensions : IP65 (NEMA4X compliant) Mounting : 8 (W)x95 (D)x8 (H) mm Weight : 5A pipe (Option; wall or rack mount) Case materials : Approx. kg and surface finish : Aluminum die-cast, metallic silver (Display keypad on the operation panel; Polyester resin, Munsel N.5) Cable entry : Cable gland for ø6~ cable, 3 ports G/ conduit threads can be connected when the cable gland is removed. Available detectors : OC-7, NOC-84, OC-95C, and other models *: The number of digits displayed for DO measurements varies by measurement range. However, all ranges can display decimal places. *: Note that HART communication requires a minimum load resistance of 5Ω and a supply voltage of 8VDC or more. Applicable Standards Product safety EN/IEC6- CE mark EMC EN/IEC636-* *(Measure variations during testing (when used with the electrode): ±%FS or less) Wiring diagrams Electrode lead ELW E Transmitter OBM-67H E Power/transmission output line (4~mADC) DC power supply DC 4V OC type Detector

3 External terminals Connection terminals for electrode lead ELW-3 or extension cable EC- E E C B A N P Connection terminals for power and transmission output cable Grounding terminal E Dimensions Unit : mm Mounted on a 5A pipe Hood (optional) Mounted on a wall or rack () Hood (optional) Display Operation keys 8 (35) Display Operation keys (35) Cable entries 5A pipe Cable entries 4-ø5.8 4 () Grounding terminal Grounding terminal Display panel Main display (when all display lamps are lit) ST-BY indication Unit indication in mg/l CAL indication ST-BY CAL mg/l % Unit indication in % OUT indication OUT WAIT C Unit indication in C WAIT indication Sub-display

4 Product code OBM67H-- A B C Y Custom spec. code; Numeric digit: 9 Alphabet: Z 3 4 A B A B Measurement range (transmission output range).~5.mg/l.~.mg/l.~.mg/l Custom specifications * Combined electrodes (ordered separately) * 7533L, 7699L (for general use and sewage treatment applications) 7536L, 7695L (for night soil treatment applications) 7546L (for float-type detectors) Polarographic electrode for fermentation process (765 L/766 L/767 L) Surface finish (coating) *3 Standard coating High performance coating Arrester *4 None Included Cable entries for power and transmission cable *5 Cable gland for ø6~ cable (standard) Cable gland (Conduit threads G/ when cable gland is removed) NPT/ supplied with 3 adapters Mounting brackets 5A pipe mount Wall or rack mount Hood (sunshade) None Equipped (5A pipe mount) (Code No K) Equipped (wall mount) (Code No ) Markings Japanese (standard) English *. Specify the measurement output range in.mg/l steps at a minimum width of.mg/l, within a range of.~5.mg/l. Ex..~8.mg/L *. The output characteristics vary according to the type of electrode used. There are 4 available categories of electrodes. Select the electrode that best fits the specifications. *3. Standard coating: Melamine primer and topcoat. Average film thickness: Greater than 3µm. Glossiness: G4. High performance coating: Epoxy primer and middle coat, polyurethane resin topcoat. Average film thickness: Greater than µm. Glossiness: G8. *4. A ceramic surge arrester (simplified) can be mounted on the power and transmission line. *5. There are 3 cable entries with cable glands for ø6~ cable (G/ conduit threads when the cable gland is removed). The NPT/ is supplied with 3 SUS36 adapters. After removing the cable glands, screw the required number of adapters into the cable entries. The standard cable glands should be left in the cable entries that are not used in order to seal them shut. Note.The OBM-67H is a -wire type dissolved oxygen transmitter that supports HART communication (version 7). It has a measurement range of.~5.mg/l. The instrument comes with a number of other features, such as temperature (-.~. C), self-diagnostics, burnout, and DO value adjustment. Note that the external input terminal used to receive output hold commands from the cleaner used with this instrument is not available as an option. Note.The combined detectors are the OC-7, NOC-84 and others. Separately order the detector together with the ELW-3 electrode lead.

5 Option Hood Recommended for installation outdoors at a location exposed to direct sunlight Material Mounting Code Number : SUS34 : Mounted on 5A pipe : 74993K Related equipment Junction box When the transmitter and electrode are installed away from each other and the standard electrode lead length (5m) is too short. Construction Weight Case Material Finish Mounting : FC-4 : Outdoor installation : Approx..9kg : ABS resin : ABS resin : Pearskin finish chromium plating : 5 ~ 5A pipe, wall or panel mount Cable port (G/) ø ± 7 ± 9 5 ± Maintenance clearance 7 ± 9 ± 3 4-M8 bolt, ømm hole Electrode lead port (G/) 73 4 ± 5~5A Pipe Extension cable The extension cable is a special cable specifically manufactured for a DO analyzer. It connects the transmitter and junction box. Outside diameter Insulation : EC- :ø8 : Polyethylene and vinyl : Vinyl : 5 MΩ or greater/m Sheath Insulation resistance between core conductors Maximum cable length : m, no cable splicing Standard length : 5m ~ m (5m unit step) Weight : Approx..5kg/5m 4 Filler (staple fiber) Conductor Paper tape Insulation Primary braiding material 3 Inner layer (inner sheath) Secondary braiding material Sheath Cross section of EC-

6 + - A power supply unit (4VDC) for the -wire type transmitter. Power supply unit : PA-4 Output voltage rating : 4VDC+3/-V Output current rating : ~ma (Parallel connection between two instruments cannot be made.) Power requirements : VAC±%, 5/6Hz Ambient conditions : -5~55ºC Construction : Indoor installation, plug-in type Weight : Approx. 3g *Output transmission signal of 4~mADC can be drawn from the terminal block. 4V output (6+, 5-) 4 Nominal tolerance ±5 mm Transmission output (3-, 4+) -ø4.5 mm (mounting hole) Power source (7, 8) AC V 5/6Hz Grounding terminal () Bar graph meter relay with DC power source Output voltage Input Alarm outputs : BMR-4 :4VDC±V : 4~mADC (input resistance; Ω) : High-high, high, low, low-low, 4 contacts (Contact rating; 5VAC,.5A) : Custom specifications : mm : Red LED, dots : 85V~64VAC, 5/6Hz, Approx. 5VA : Approx. 5VA Scale Scale length Display Power requirements Power consumption Ambient conditions : ~45ºC, 4~8%RH Weight : Approx. 45g Name plate (top, bottom) Scale length Escutcheon (left,right) ph Panel cut-out

7 Detectors used with the OBM-67H The following table lists the model type, general specifications, and configuration of the detectors that can be used together with the OBM-67H. Select the detector that best fits the installation and measurement conditions in which you intend to use the unit. The DO electrodes available for use are the 7533L (for general use and sewage treatment applications) and 7536L (for night soil treatment applications). The dedicated electrode lead is the ELW-3. For details about the specifications,see the separate specification sheet for the detectors used with the dissolved oxygen analyzer/transmitter. Product name Installation configuration Sample temperature Ambient temperature Working pressure range Weight Applicable electrode Wetted part materials Immersion type DO electrode holder.3mpa or less Approx. kg (when total length is m) Drop-in type DO detector Approx. 7kg (when protection tube length is 5m) Drop-in type DO electrode holder Approx. 3kg (when protection tube length is m) Flow-through type DO electrode holder Approx. kg Flow-through type DO electrode holder OC-7 OC-95 OC-99 NOC-84 NOC-85 Immersion-type Immersion-type (drop-in type) Flow-through type ~45 C (no freezing) -5~5 C.MPa or less.5mpa or less.3mpa or less 7533L (for general use) or 7536L (for night soil treatment applications) Detector: SUS36, PVC, PP Holder: PVC, PP Holder: PVC, PP Protection tube: Protection tube: Case: PVC SUS34 PVC Approx. 5kg Holder: PVC, PP Case: SUS36 Configuration

8 International Operations: DKK-TOA Corporation 9-, -Chome, Takadanobaba, Shinjuku-ku, Tokyo Japan Tel : Fax : Information and specifications are for a typical system and are subject to change without nofice. Issued on 8//