Table 7.

Hydrogen concentration measurement range, accuracy and repeatability of fault detection monitors (as indicated by manufacturers).

Equipment	Measurement Range (ppm)	Accuracy	Repeatability
Calisto 2	2–50.000	$\pm 2$ ppm or $\pm 5$%	$\pm 2$ ppm or $\pm 3$%
SmartDGA Guard	5–10.000	$\pm 5$ ppm or $\pm 5$%	–
Minitrans	5–5.000	$\pm 5$ ppm or $\pm 10$%	–
Hydran 201Ti	25-2.000	$\pm 25$ ppm or $\pm 10$%	$\pm 10$ ppm or $\pm 5$%
Hydran M2-X	25–2.000	$\pm 25$ ppm or $\pm 10$%	$\pm 10$ ppm or $\pm 5$%
MHT410	0–5.000	$\pm 25$ ppm or $\pm 20$%	$\pm 15$ ppm or $\pm 10$%
CoreSense	0–5.000	$\pm 25$ ppm or $\pm 20$%	–
DGA 150	50–5.000	$\pm 25$ ppm or $\pm 20$%	$\pm 15$ ppm or $\pm 10$%
Serveron TM1	20–10.000	$\pm 20$ ppm or $\pm 15$%	$\pm 5$ ppm or $\pm 10$%
Hydrocal 1003	0–2.000	$\pm 25$ ppm or $\pm 15$%	–
Hydrocal 1004 GenX	0–6.000	$\pm 20$ ppm or $\pm 10$%	–
Hydrocal 1005	0–2.000	$\pm 25$ ppm or $\pm 15$%	–
H2 Guard	25–5.000	$\pm 25$ ppm or $\pm 20$%	$\pm 15$ ppm or $\pm 10$%
Multisense 5	0–2.000	±LDL ppm or $\pm 15$%	–

–: Not indicated by the manufacturer.