BetaCAP30X100 is the lucky union of two modules : the CAP30 gas divider, well described in a previous section of this web site and a new module CAP1A100 which will be the main subject of this chapter. The module CAP1A100 uses 100 capillaries to provide a fixed dilution rate of 1/100. Born to have an autonomous life, in fact up to now it’s just used as “pre-divider” to improve the performances of other diluters. It has his own control circuit and is connected to CAP30 through a serial port RS485 which allows receiving the commands with setpoints from BetaCAP30 also asking and receiving confirmations, alarms, statuses and measurements. As CAP30, also CAP1A100 is complete of a mathematical functions description, than his control is managed together with CAP30 control. Low level controls in CAP1A100 (activation, de-activation and pressures controls) are self managed, but setpoints comes from CAP30, which is the “Master unit”. The first impact in joining CAP1A100 to CAP30 is an appearing incompatibility : CAP1A100 seams made to handle a constant flow and CAP30 to receive from CAP1A100 very variable flows: you can see that changing CAP30 dilution from 0/30 to 30/30 the flow request to CAP1A100 changes from 0 to the maximum diluter output flow. We will see later that controlling the flows in BetaCAP30X100 is not so difficult.
During the operation, the pre.divider is activated when the requested dilution is higher than 0,5/30.
- Total dilution ≥ 0,5/30 :up to this point the CAP1A100 module is bypassed with SV07 OFF (as shown in the diagram) and CVby is fully closed. Then Span gas flows all in CV1.2. In the pre-divider the control CV01 and CV1.1 are off and also zero gas goes directly to CAP30 in CV0.2 valve.
- 1/100 < Total dilution < 0,5/30 The pre-diluter CAP1A100 is managed in a way of getting a fixed dilution 1/60, than CAP1A100 is running with SV07 ON, CVby modulating and both CV0.1 and CV1.1 also modulating. The dilution target of CAP30 is Total target x 60
- 1/100 < Total dilution ≤ 0.5/3000 : The pre-diluter is always ON and set to dilute 1/100. The dilution target of CAP30 is Total target x 100
In fact, the user of BetaCAP30X100 have two dilution ratio available : one between 0/30 and 30/30 and the other between 1/3000 and 30/3000 without having to care about the CAP1A100 settings. Apparenly between the two diluting ranges there is an interruption : this is covered forcing the pre-diluter to work at 1/60 in place of 1/100. The results are as expected and the accuracy is not compromized.
As with BetaCAP30, also BetaCAP30X100 offers the operating mode “set diluted concentration target” with uninterrupted coverage of the dilution ranges from 0,5/3000 to 29,5/30, in addition to zero and span..
Depending on the application type,BetaCAP30 can be supplied in different versions:
- Max diluted gas flow: different values can be supplied alternately by using capillaries with 1m 3 or 4 holes (measures indicated in drawings are in tenths of mm). The user is free to set different flows in the range 10%….100% of the max. range supplied
- Gas contacted materials: the standard construction is with PVDF (an highly resistant to cottosion fluorinated plastics. In case of handling toxyc or explosive gases, we suggest the “all steel” version with AISI316L stainless steel, where the risk of cracks in tubes or fittings is more remote.
- Casing type: depending on the type of moving (portable or rack mounted) BetaCAP30 can be supplied in a compact and rugged plastic case with handle (ext. Size: 41,7 x 22,1 x 33,4 cm) or in a 19” rack drawer 3HU with or without an external shocks protection.
Technical Specifications
| Dulution details | |
| Dilution range (Steps) | from 0/30 to 30/30 step1/30 (3,33%) and from 1/3000 to 30/3000 step 1/3000 |
| Diluition ranges (Uninterrupted) | Continuous from 0,5/3000 to 29,5/30 and step zero and span |
| Accuracy | < 0,2 % of the read value + 0,00005% of the range |
| Repetability | < 0,1 % of the read value |
| Gas contacted materials | |
| Standard | Plastics PVDF |
| Optional | Stainless steel AISI316L |
| Diluted gas flow | Can be set in the range 10% to 100% of the Max flow. |
| Small capillary size | 1 hole Diam. 0,1 mm |
| Medium size | 3 holes each Diam. 0,1 mm |
| High size | 4 holes each Diam. 0,1 mm |
| Case size | |
| BetaCAP30X100 CP (Compact) | 41.7 x 22.1 x 33.4 cm |
| BetaCAP30X100 RK (19”Rack) | 41.7 x 22.1 x 33.4 cm |
| Electrical power supply | 100 to 240 Vac – 50 – 60 Hz |
