Description
Design standard
Following DIN 16001 / EN837-1 (where DIN 16001 refers to EN837)
Dial sizes, ranges & accuracy
Possibilities in ranges and accuracies are led by the dial size. Accuracy class is based on dry gauges. Liquid filling can affect the accuracy.
| Dial size | Ranges | Accuracy |
|---|---|---|
| 100mm | >1600 to 0...7000 bar | 1.0% <6000 bar 1.6% 6000, 7000 bar (1% optional) |
| 160mm |
Process connection
| size | Standard thread | Optional |
| 100mm | 9/16” UNF Female (According Autoclave F250C) | 9/16” 18 UNF LH Male (According Autoclave M562C) |
| 160mm |
Other threads possible on accordance between manufacturer and user.
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 | • | • | • | • | • | • |
| 160mm | • | •1 | • | •1 | •1 | • |
*1) Type B, D and E, 160mm only for ≤3000 bar
Materials of construction
- Case AISI 304 (optionally 316)
- Bezel AISI 304 (optionally 316)
- Connection*1 AISI 316
- Sensing element*1 AISI316 /Ni Span-C 902/ 25CrMo4*2
- Movement Stainless steel
- Pointer Aluminium
- Dial Aluminium
- Window gasket NBR
- Blow out NBR
- Fill plug NBR (HNBR for filled gauges)
- Mounting flanges AISI 304
- Window Laminated safety glass
*1) wetted materials
*2) 25CrMo4 is not suitable for water (only for non-corrosive media)
Pressure limitations
The gauges are built to withstand harsh environments however the DIN 16001 limits the use of a pressure gauge according below table.
| Dial size | Steady | Fluctuating | Short time |
| 100mm | 0.75 x FSV | 0.67 x FSV | FSV |
| 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 case | -40°C …+60°C | -40°C…+200°C |
| Filled case | -20°C …+60°C | -20°C…+90°C |
The variation of indication caused by the effect of temperature shall not exceed: ± 0.4% / 10K FSV
Window Standard
BDT18 HP gauges have a laminated safety glass.
Pointer
Standard pointer is a fixed black painted aluminum pointer. As options a slotted and micro adjustable pointer are available
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 837-1. Options like colored dial, customer logo, or colored segments are possible as well. However, the gauge is following the DIN 16001 it will not be printed on the dial like the BDT-20 HP. ASME dial facing (divisions) available on request (see table 3)
Limit stop
The BDT18 HP has a 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.
Degree of protection
The BDT18 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.
Case filling
The gauges can be filled with different kind of fill fluids. The fill fluids available are: • BPF01 – Glycerine 86% • BPF02 – Silicon • BPF06 – Glycerine 99.5%
Restrictor Screw
All gauges can be executed with a restrictor of 0.8 or 0.3 orifice in AISI316. Optional the restrictor can be secured in the connection so the restrictor cannot come out with vibration and damage your installation.
