Direct Extractive Heated Filter Probes for General Purpose Applications
Baldwin’s Direct Extractive Heated Filter Probes feature an advanced design to extract sample gas and remove particulate while preventing condensation prior to the gas sample entering the heated sample line.
New Machine-Lathed Sure-Lock™ Filter Assembly
Baldwin’s new Sure-Lock filter assembly is precision machined and features a unique design to help ensure proper insertion into the assembly and to reduce the possibility of leaks. The filter head is inserted into a notch in the assembly to ensure proper alignment before locking it in place. The o-rings are tightened under compression, rather than being located on the sides of the filter head, to reduce the risk of leakage.
- Sure Lock™ filter assembly reduces risk of leakage
- Broad range of filter elements designed for various applications
- Insulated enclosure with heat-shrink sample line boot to maintain constant temperature
- Available with air blowback system
Options Available:
- Schedule 40, Schedule 80, Hastelloy, and Durinert+ stinger probes
- Sintered stainless steel, screen mesh, ceramic, glass fiber, and Hastelloy filter elements
- Air blowback system with 115 VAC, 230 VAC, 12 VDC, or 24 VDC solenoid
- Solenoid to close sample line when blowback is initiated
- Gas cooling spool piece for high temperature gas sources
- Eliminates the complexity of separate temperature controllers heater bands and Kalrez o-rings for high temperature sampling requirements
- Various size flanges
- Durinert™ or Teflon coated filter assembly option for corrosive gas streams
Model Specifications
| Model | Blowback | Filter Assembly Temp Control |
Temp/Blowback Circuit Board |
Enclosure | Dimensions* | Weight |
| 33C | N/A | Self Regulated |
N/A | NEMA 4 Steel |
14x12x8 in 36x30x20 cm |
30 lbs 14 kg |
| 34C | 2-way solenoid |
External Regulated | N/A | NEMA 4 Steel |
14x12x8 in 36x30x20 cm |
34 lbs 15 kg |
| 34C-R | 2-way solenoid |
Self Regulated |
N/A | NEMA 4 Steel |
14x12x8 in 36x30x20 cm |
34 lbs 15 kg |
*Excluded probe stinger and heat-shrink boot.
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Product Specifications
| Area Classification | General Purpose |
| Filter Assembly | Sure-Lock, 316 stainless steel |
| Filter Element Types | 10 micron sintered SS (standard) 5, 20 micron sintered SS 2 micron ceramic 2 micron SS screen mesh 0.1 micron glass 0.7 micron glass / TFE coated 2 micron Teflon |
| Probe Lengths | 18 inch, 1, 2, 3, 4, 5 foot |
| Probe Material | Schedule 40, Schedule 80 stainless steel or Hastelloy |
| Connections | 1 1/4″ male pipe nipple mount; 1/2″ female pipe thread for stinger |
| Connectors | 1/4″ cal gas, 3/8″ blowback, 3/8″ sample line |
| Thermocouple | Type K |
| Heater Type | Silicone rubber blanket w/metal snap closures, 100W (standard) |
| Heat-shrink Boot* | 7″ length, 2.75″ min expanded I.D. nose |
| O-rings | Viton™ |
| Gaskets | Graphoil™ |
| Enclosure Insulation | 1/8″ thick silicone, medium density |
| Calibration Gas Requirement | 20 psig, 6-10 LPM |
| Probe Operating Temperature | 375°F (190°C) |
| Input Voltage | 115 (230 optional) VAC, 50/60 Hz |
Blowback System Specifications (Models 34C, 34C-R)
| Blowback Duration | 5 sec standard |
| Instrument Air for Blowback | Min 50 psig, Max 90 psig |
| Blowback Accumulator Tank | 16 ga. SS, 4×8 inch cylinder |
| Blowback Flow rate | 14 scfh |
| Blowback Sokenoid Valve (Model 4P-34C-R only) |
Line voltage (standard) 12VDC, 24 VDC (optional) |
Baldwin™ is a Trademark of Perma Pure LLC
Viton™ is a Registered Trademark of DuPont
Graphoil™ is a Registered Trademark of Union Carbide Corporation
