Level, Conductivity, and Temperature Transmitter with RS485 Digital Interface — 36 Xi W
Спецификация 36 Xi W
Available on request
Delivery across Russia
Order phone: +7(800)777-18-50
Description
The 36 Xi W series is based on a next-generation microcontroller developed by Keller, meeting extremely high accuracy requirements and compatible with a wide range of interfaces. Along with pressure (level) information, data on water parameters such as temperature and conductivity can also be transmitted via the digital interface.
RS485 – Reliable interface for various types of pressures, for lines up to 1.4 km long. Modbus RTU and proprietary KELLER bus protocol
SDI-12 – Standard interface for environmental monitoring, ideal for battery-operated devices
The 36 Xi W devices are based on the proven 36 X devices, which use high-quality pressure sensors from the 10 L series. All X series level converters feature an RS485 digital interface that meets temperature and pressure standards. Optionally, sensors with enhanced accuracy, temperature, and conductivity parameters are also available. Multifunctional devices equipped with pressure, temperature, and conductivity sensors (CTD – conductivity, temperature, depth) have a length of approximately 90 mm.
36 Xi W
Pressure sensor: accuracy 0.02 %FS
Temperature sensor: accuracy 0.5 °C or 0.1 °C
36 Xi W CTD
Pressure sensor: accuracy 0.02 %FS
Temperature sensor: accuracy 0.1 °C
Conductivity sensor: accuracy 1% of the selected range. 4 ranges: 0.2 / 2 / 20 / 200 mS/cm
Both versions can be configured to measure absolute pressure (measurement relative to vacuum → PAA) or relative pressure (device equipped with a capillary tube for measuring pressure relative to atmospheric pressure → PR).
Options
- Housing options: Hastelloy or titanium construction
- Threaded process connection
- Cable made of other materials: PTFE-Teflon or Hitril (for petroleum products)
- Specifications
- Overall Drawing
- Connection diagram
- Applications
| Pressure | |
| Standard ranges1) | from 0…3 mH2O to 0…300 mH2O2) |
| Overload resistance | max. 300%FS |
| Device | oil-filled, isolated piezoresistive pressure transducer in metal housing |
| Resolution | standard 5 ppm (corresp. 0.0005 %FS) |
| Basic error3) 5) | max. ± 0.02 %FS (for range 0…3mH2O: ± 0.04 %FS) |
| Compensated temperature range | 0…50 °C |
| Total error4) 5) | max. ± 0.1 %FS (in range 0.3: ± 0.2 %FS) |
| Operating temperature5) | -20…80 °C |
| Internal measurement frequency (configurable) SDI-12 conversion time |
120, 240 (default), 480 Hz < 600 ms for pressure and temperature |
| Long-term stability | in ranges > 1 bar: max. ± 0.1%FS in ranges ≤ 1 bar: max. ± 1 mbar |
| Position dependence | max. ± 1.5 mbar |
| Temperature | |
| Measurement range | -10…80 °C |
| Device | silicon (pressure sensor measuring bridge, TOB6), optionally Pt1000 |
| Resolution | < 0.01 °C |
| Accuracy | silicon sensor: standard ± 0.3 °C Pt1000 sensor: max ± 0.1 °C |
| Measurement interval | 80 ms – TOB6) only 160 ms – Pt1000 without conductivity 2 s – Pt1000 with conductivity |
| Conductivity | |
| Measurement range | 0 µS/cm…200 mS/cm |
| Ranges available via software | 0.2 / 2 / 20 / 200 mS/cm |
| Device | 6 platinum electrodes, 4-wire |
| Compensated temperature range | -10…+60 °C |
| Resolution | < 0.05% of selected range |
| Accuracy | < 1% of selected range |
| Mechanical characteristics | |
| Dimensions | ø 22 mm, length see drawing |
| Weight | approx. 170 g without cable (CTD approx. 300 g) |
| Housing material | stainless steel 316L (DIN 1.4435 / 1.4404) |
| Cable material | PR: polyethylene (PE) PAA: polyolefin (PE-based) |
| Other materials in contact with medium | seals: Viton®, protective cap: POM, conductivity (optional): platinum, PEEK |
| Standards and protection | |
| EMC compatibility | EN 61000-6-2: 2005 EN 61000-6-3: 2007 EN 61326-2-3: 2006 |
| Reverse polarity and overload protection | ± 32 VDC power and RS485 ± 24 VDC SDI-12 |
| Standard lightning protection according to EN 61000-4-5 | Line-Line: 50 A at 8/20 µs Line-CASE: 200 A at 8/20 µs |
| Additional lightning protection | Line-Line: 10 kA at 8/20 µs Line-CASE: 2 kA at 8/20 µs |
| Protection class | IP68 |
1)Pressure measurement buffer: pressure is measured when output reaches 10% outside the range in both directions, in this case values “+Inf” or “-Inf” are transmitted.
2)Subconn® connector increases pressure range by up to 30 bar. For ranges > 10 bar available only in versions without conductivity sensor
3)Linearity (best straight line), hysteresis and repeatability
4)Accuracy and temperature error in compensated temperature range
5)Outside the compensated temperature range up to the limits of the operating temperature range, deviation will exceed the displayed value by a maximum of 2 times
6)Temperature information for pressure sensor (TOB: top of bridge)
7)Power consumption without communication. During response (9 ms at 9600 baud, 1 ms at 115,200 baud), additional 1...40 mA depending on line interruption
| Electronics Data | RS485 | SDI-12 |
| Power Supply ‧ with additional lightning protection |
3.2…32 VDC 4.5…32 VDC |
6…32 VDC |
| Power Consumption ‧ without conductivity ‧ with conductivity |
< 6 mA (active) 7) < 14 mA (active) 7) |
< 0.1 mA (sleep) < 5.5 mA (active) < 13 mA (active) |
| Start-up Time (power ON) | < 300 ms | < 5 ms (interface ready) |
| GND-CASE Isolation | > 10 MΩ at 300 V | |
| Durability | > 10 million cycles of pressure change 0…100 %FS at 25 °C |
|
| Storage Temperature | -20…+80 °C | |
| Digital Interface | RS485 | SDI-12 |
| Communication Protocol | Modbus RTU KELLER bus |
SDI-12 V1.3 |
| Data Rate | 9600, 115,200 bit/s | 1200 bit/s |
| Designation | Class.Group: 5.21 | |
| Pressure Units | bar | bar, mbar, mH2O, psi, ftWC, inWC |
| Temperature Units | °C | °C, °F, K |
| Conductivity Units | mS/cm | mS/cm |
RS485
Modbus RTU / KELLER bus Protocol
The highly reliable RS485 interface allows creating a network including up to 128 devices and a length of up to 1.4 km. The half-duplex interface speed can be switched between 9600 and 115,200 baud. The proprietary KELLER bus protocol and Modbus RTU protocol are already integrated, allowing data reading as well as configuration and calibration. For this, the free CCS30 software for PC can be used.
Measurement channel assignments (up to 4 channels):
P1 Pressure
TOB1 Temperature (silicon sensor)
T Temperature (Pt1000)
LF Conductivity
Detailed descriptions of the RS485 communication protocols can be found on the KELLER website.
SDI-12
Alongside the standard RS485 interface, providing access to all configuration registers, the level converter is also available in a version with an SDI-12 interface. Only one interface type can be active at a time. Switching between them is done using corresponding commands (default setting: SDI-12). SDI-12 is a standard proven in the use of dataloggers and digital sensors in monitoring applications. SDI-12 has been optimized for use in battery-powered systems that include both dataloggers and sensors combined into one network. The interface is based on a standardized protocol using ASCII. In SDI-12 mode, the pressure converter is active only during polling by the logger or during measurements. At all other times, the device is in standby mode and consumes very little power (<1 mA).
