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Whats the point of 4 digit readout if the accuracy. However, they do excel in the coolness factor. CAUTION Any serious arc or discharge that reaches the a vacuum gauge sensor. Means. should be provided to prevent this from occurring. Metal plumbing in the. Locating the sensors in regions. All types of vacuum gauges are readily available, new, surplus, e. Bay, and. elsewhere. However, before you grab the first one available, make sure it. However, on places like e. Bay, it may be. cheaper to bid on the electronics separately from the sensor as the. It is possible to build a TC gauge readout for next to nothing with parts. See the next section for my. The article. Thermocouple Vacuum Gauge also includes information on a home made. It. also mentions the Pirani and thermistor gauges, which operate on similar. Teledyne Hastings manufactures one. TC vacuum gauges and controllers. A gauge is just a readout a controller. Note that in what follows, I use the term control. TC gauge tube to. TC vacuum gauge, usually an analog meter movement or. They may be found. Downloads. Basic information on the Hastings TC sensors they call these thermopile. Vacuum Sensors Page. The chart below has the functional specifications. Hastings models. Duniway Stockroom sells some of these under their. Other manufacturers like Varian and Veeco may have. There are two common types of Hastings TC gauge sensors Those using an AC. DV 3, DV 4, DV 5, DV 6, and DV 8 and those with. DV 2. 3 and DV 2. The first group bring out. I currently do not have detailed information on the DV 2. DV 2. 4 group except that they are used with Hastings Economy line of vacuum. DV 3DV 6 and DV 4, respectively. If anyone has such info, please contact. Sci. Electronics. Repair FAQ. Email Links Page. A third type of TC gauge sensor using either an AC or. DC heater with a pair of wires for the thermocouple is used by manufacturers. Varian and Veeco. Some older samples of the DV 3. M, DV 4. D, DV 5. M, DV 6. M. and DV 8. M may not have the letter suffixes but are electrically equivalent. DV 8 instead of DV 8. M. The two sets of DV 4s are not quite identical. There is also. a DV 1. Torr used with the NV 1. I havent found info on it. TC Gauge Tube Model. Metal case DV 3. M DV 4. AM DV 4. D DV 5. M DV 6. M DV 8. M DV 2. DV 2. Ruggedized DV 4. R DV 6. R. SSCeramic DV 3. DV 3. 6. Pyrex case DV 1. DV 1. 6 DV 1. 6D DV 1. DV 2. 0 DV 3. 1 DV 4. DV 4. 4. Some of the Readout Models. GV 3 SP 1 VT 4 VT 5 VT 6 SL 1 VH 3 VH 4. SV 1 VC 1. 4 TP 7. A LV 1 TV 4. A NV 8. B. VC 2. 3 VC 2. RV 9 VC 1. TV 5. A. RV 2. C RV 4. C RV 1. 4 VC 2. RV 8. RV 2. S RV 4. S TV 4. RV 1. RV 1. 6. TV 4. Some of the Controller Models. Single Set Point CVT 1. CVT 1. 5 CVT 1. CVH 3 CVH 4. Dual Set Point CVT 2. CVT 2. 5 CVT 2. Pressures m. T. Best Sens Range 2. Useful Range 1 1k 1. Volume cu. in. 12 12. Current AC m. A 1. Voltage AC m. V 3. Power m. W 3. Resistance ohms 2. TC Temperature C. At high vacuum 2. At atmosphere 1. TC Output at High. Vacuum DC m. V 1. Response Time s. Atm high vacuum 3. High vacuum atm 0. Heater lt 3 5 lt 2 46 8. TC Output lt 7. Base color Black Blue Purple Red Yellow Green Orange White. Note m. T m. Torr 1. Torr 1 micron of Hg. All tubes in a given column are functionally equivalent and electrically. The top one e. g., DV 4. D. is much more common and has a much lower list price than the others. However, since the others arent as well known and in less demand, it may be. DV 3. 4 at a very low price from a surplus. A simple cable adapter is then all that is needed to. Not on this list are chart recorder readouts and controllers like the. MRV 6 for the DV 6. M and similar TC gauge tubes. With the availability of. PC based data acquisition, they are probably no longer available. The DV 4. AM and DV 4. D series appear to be quite similar in performance. The heater current is slightly different but from what Ive seen, the. I have that. is supposedly for a DV 4. AM is actually for a DV 4. AM, the response might. Torr. Other than the markings for 2. Torr. the calibration looks about the same, so it might have just been a. CAUTION DO NOT attempt to test TC gauge tubes for resistance or continuity. VOM There may be enough current on its low ohms scale to burn. TC gauge tube heater. Confirm that any DMM has a low enough current. Similar precautions apply to the analog meter movements on. Even a DMM will probably peg the meter needle on. CAUTION DO NOT mount a thermocouple gauge tube directly on the vacuum. The internal wiring. I havent experienced a failure myself but have heard. I dont know if it was simply a tube about to die. Speaking of which, I dont have much confidence in the values given above for. TC gauge tube voltage and current. In testing various Hastings TC gauge tubes. Ive found that the rated full scale output which I do trust since that is. A typical Hastings meter has a sensitivity of 2. A. full scale and input resistance of 4. V full scale. Using a. Thus, if your gauges. Hastings meter, its input resistance. This resistance can be used to tune the. I dont know at what point the calibration curve will be. There are A and B versions of the common VT readouts and CVT. VT 6. A or CVT 6. B. Both include cables for power and. TC gauge tube, and control output CVT only. The A version is for. B version is housed. As can be seen from the chart above. And, this labelling isnt entirely. I have made meter face templates for the DV 4, DV 5, DV 6, DV 2. DV 2. 4 TC gauge tubes based on graphics from the Hastings Web site for the. SV 1, VT 4, VT 5, VT 6, CVH 3, and CVH 4, respectively, but somewhat improved. These are all the newer flattened style meters. For the DV 8, I modified one of these based on my NV 8. B as best I could by. I dont actually know if there iswas an actual VT 8 gauge but. I labeled it. Note that unlike the others, the right hand limit. VT 8 meter represents a substantial output from the thermocouple. Torr. From my measurements of the NV 8. B, 1. 0 m. Torr the upper pressure limit of. TC gauge tube voltage. In fact, the VT 5 meter scale looks like it should be. DV 8 tube as the DV 5 and DV 8 tubes are. For the DV 3, I used a photo of the meter from an SV 1. And like the DV 8. I dont actually know if there iswas an actual VT 3 gauge but thats how. I labeled it. This is the only one using the older style meter design. The following templates may be useful for home built TC gauges see the next. Modify the size of these as required for your meter, print out on high. For normal. meters without a reversal circuit, they will first have to be mirrored. I have determined the approximate calibration curves for these tubes based.