Description
Badotherm pressure gauge model BDT18-SB is manufactured according to the EN837-1 and is available in full stainless steel or Alloy 400. This pressure gauge is typically used for applications in the chemical, petro-chemical, oil & gas, power and utilities, machine building and general process industries. Safety comes first, with a blow-out feature, pressure elements made high quality tubes and the welded type connection construction. These gauges are designed to withstand the severest of operating conditions of the ambient environment and the process medium.
Design standard
EN 837-1
Dial sizes, ranges & accuracy
Possibilities in ranges and accuracies are led by the dial size. The reduced volume execution specially designed for the use on diaphragm seals (code_R). Accuracy class is based on dry gauges. Liquid filling can affect the accuracy.
| Dial size | Ranges | Accuracy |
|---|---|---|
| 100mm (100R) | 0…1 to 0…1000 bar 0...15 to 0...15,000 psi | 1.6% (option 1.0%) |
| 100mm | 0…1 to 0...1600 bar 0...15 to 0...25,000 psi | 1.0% (option 0.6%) |
| 160mm | ||
| 160mm (160R) | 1.0% |
Mounting variation
Not all gauges are suitable for some mounting variations. For the BDT18-SB series the mounting variations are below.
- type A (10) Bottom connection (LM), direct mounting
- type B (33) Lower-back connection (LBM), U-bracket
- type C (11) Bottom connection (LM), surface mounting (back flange)
- type D (30) Lower-back connection (LBM), direct mounting
- type E (32) Lower-back connection (LBM), panel mounting (front flange)
- type F (12) Bottom connection (LM), panel mounting (front flange)
More specifically per dial size:
| Dial size | Type A | Type B | Type C | Type D | Type E | Type F |
| 100mm (100R) | • | • | ||||
| 100mm | • | • | • | • | • | • |
| 160mm | • | • | • | |||
| 160mm (160R) | • | • |
Process connection
| Dial size | Standard thread | Optional | SW size |
| 100mm (100R) | G ½ A or ½” NPT | 1/4", 3/8" | 22mm |
| 100mm | |||
| 160mm (100R) | |||
| 160mm |
Other thread standards such as ISO 7-1 R (BSPT), or DIN 13-1 (M20x1.5) can be selected as well.
CONSTRUCTION materials
| BDT18-SB | BDT18…M | |
| Case | AISI 304 | |
| Bezel | ||
| Connection1 | AISI 316 | Alloy 400 |
| Sensing element | AISI 316 | Alloy 400 |
| Movement | Stainless steel | |
| Pointer | Aluminum | |
| Dial | ||
| Window gasket | NBR | |
| Blow-out | ||
| Fill plug | NBR (HBNR for filled gauges) | |
| Mounting flanges | AISI 304 | |
| Window | Laminated safety glass | |
1 wetted materials
Pressure limitations
The gauge are built to withstand harsh environments however the EN 837 limits the use of a pressure gauge according below table.
| Dial size | Steady | Fluctuating | Short time |
| 100mm (100R) | 0.75 x FSV | 0.67 x FSV | FSV |
| 100mm | |||
| 160mm (100R) | |||
| 160mm |
FSV: full scale value
Temperature limitations
The gauges can withstand ambient and process temperature up to a certain limit. The limitations on temperature are:
| Ambient | Medium | |
| Dry | -40°C …+60°C | -40°C…+200°C |
| Glycerine filled | -20°C …+60°C | -20°C…100°C |
| Silicone oil filled | -40°C …+60°C | -40°C…100°C |
The variation of indication caused by the effect of temperature shall not exceed: ± 0.4% / 10K FSV
Window
Standard BDT18-SB gauges have a laminated safety window. Depending on the case size options such as glass, or acrylic windows are available.
Pointer
Standard pointer is a fixed black painted aluminum pointer. There are several types of pointers available:
- Adjustable slotted pointer
- Micro adjustable pointer
Dial facing
The dial plate is made from aluminum and coated with UV resistant white coating. The black dial markings, scale, numbering, and interval is according the EN 837. Options like colored dial, customer logo, or colored segments are possible as well. Scale interval and numbering is following the EN837. ASME dial facing (divisions) available on request (see table 3)
Limit stop
100mm and 160mm gauges are equipped with an internal limit stop on the movement to prevent, in case of overpressure, the pointer reentering the scale (graduations) thus preventing the operator reading a low pressure when in fact the pressure is dangerously high. This internal limit stop normally engages at approx. 130% of full scale value. The gauges have a free zero except for 100R gauges which are equipped with a pointer stop on the dial.
Degree of protection
The BDT18-SB has a standard degree of protection of IP65. The values are determined according the IEC/EN 60529. Class IP66 and IP67 are available as option.
Add-on contacts
The BDT18-SB size 100 and 160mm can be supplied with a BDT3101 add on contact in various contact types such as Inductive, Magnetic, and Electrical. The “BDT31-01 contacts” data sheet will give specific options and limitations on these contacts.
Case filling
The gauges can be filled with different kind of fill fluids. The fill fluids available are:
- BPF01 - Glycerine 86%
- BPF02 - Silicon
- BPF03 - Silicon for contacts
- BPF04 - Mineral oil (Foaming service)
- BPF05 - Halocarbon (inert fluid for oxygen service)
- BPF06 - Glycerine 99.5%
Note: Chevrier Instruments Inc. fills the gauges with 67.3% Glycerine.
Restrictor Screw
All gauges can be executed with a restrictor of 0.8 or 0.3 orifice in AISI316. For the Alloy 400 internal the orifice is 0.8mm.
Special service
The gauges can be supplied cleaned for oxygen use. This means the gauge is assembled and tested in a special area free of oil. The gauges are individually packed in a plastic bag with marking. The symbol used is:
Certification & Declaration
Calibration
Gauges are full range calibrated as a factory standard. Optionally you can select a 5 points calibration certificate, and a 10 points calibration certificate for the 0.6% and 0.5% gauges.
Pressure Equipment Directive - 2014_68_EU
PED approval is given according article 3.3 and is valid for ranges >200 bar. All gauges will be marked accordingly. A declaration of conformity can be supplied.
ATEX 114 - 2014/68/EU
ATEX restrictions are explained in the IOM and in the ATEX background datasheet.
EN 10204 material certificate
A material 3.1 certificate on the wetted parts can be supplied.
